configure.ac

# configure.in --- xscreensaver, Copyright (c) 1997-2020 Jamie Zawinski.
#

AC_PREREQ(2.52)
AC_INIT(driver/subprocs.c)
AC_CONFIG_HEADERS([config.h])

echo "current directory: `pwd`"
echo "command line was: $0 $@"

###############################################################################
#
#       Autoheader stuff
#
###############################################################################

AH_TOP([
/* config.h.in --- xscreensaver, Copyright (c) 1991-2020 Jamie Zawinski.
 *
 *  The best way to set these parameters is by running the included `configure'
 *  script.  That examines your system, and generates `config.h' from 
 *  `config.h.in'.
 *
 *  If something goes very wrong, you can edit `config.h' directly, but beware
 *  that your changes will be lost if you ever run `configure' again.
 */
])

AH_TEMPLATE([HAVE_READ_DISPLAY_EXTENSION],
	    [Define this if you have the SGI XReadDisplay extension.])

AH_TEMPLATE([HAVE_XHPDISABLERESET],
	    [Define this if you have the XHPDisableReset function (an HP only
	    thing which allows the Ctrl-Sh-Reset key sequence to be
	    temporarily disabled.)])

# This only ever existed in X11R4 and X11R5.
AH_TEMPLATE([HAVE_XIDLE_EXTENSION],
	    [Define this if you have the X11R5 XIDLE extension.])

AH_TEMPLATE([HAVE_MIT_SAVER_EXTENSION],
	    [Using the MIT-SCREEN-SAVER extension means that the X server
            will crash at random times, and fading and hysteresis won't work.
            Don't use this.  You'll be sorry.  See comment in xscreensaver.c.])

# This only ever existed on SGI hardware.
AH_TEMPLATE([HAVE_SGI_SAVER_EXTENSION],
	    [Define this if you have the SGI SCREEN_SAVER extension.])

# This only ever existed on SGI hardware.
AH_TEMPLATE([HAVE_SGI_VC_EXTENSION],
	    [Define this if you have the SGI-VIDEO-CONTROL extension.])

AH_TEMPLATE([HAVE_DPMS_EXTENSION],
	    [Define this if you have the XDPMS extension.])

AH_TEMPLATE([HAVE_XF86VMODE],
	    [Define this if you have the functions XF86VidModeGetModeLine()
	    and XF86VidModeGetViewPort(), in support of virtual desktops
	    where the X server's root window is bigger than the actual
	    screen.])

AH_TEMPLATE([HAVE_XF86VMODE_GAMMA],
	    [Define this if you have the functions XF86VidModeGetGamma() and
	    XF86VidModeSetGamma(), which allow clients to change the gamma
	    response of the monitor.])

AH_TEMPLATE([HAVE_XF86VMODE_GAMMA_RAMP],
	    [Define this if you have the functions XF86VidModeGetGammaRamp()
	    and XF86VidModeSetGammaRamp(), which provide finer-grained
	    control than XF86VidMode[GS]etGamma().])

AH_TEMPLATE([HAVE_XINERAMA],
	    [Define this if you have the Xinerama extension.])

AH_TEMPLATE([HAVE_XINPUT],
	    [Define this if you have the Xinput extension.])

AH_TEMPLATE([HAVE_XF86MISCSETGRABKEYSSTATE],
	    [Define this if you have the XF86MiscSetGrabKeysState function
	    (which allows the Ctrl-Alt-KP_star and Ctrl-Alt-KP_slash key
	    sequences to be temporarily disabled.  Sadly, it doesn't affect
	    Ctrl-Alt-BS or Ctrl-Alt-F1.)])

AH_TEMPLATE([HAVE_RANDR],
	    [Define this if you have the Resize and Rotate extension.])

AH_TEMPLATE([HAVE_RANDR_12],
	    [Define this if the RANDR library is version 1.2 or newer.])

AH_TEMPLATE([HAVE_PROC_INTERRUPTS],
	    [Define this if you have a Linux-like /proc/interrupts file which
	    can be examined to determine when keyboard activity has
	    occurred.])

AH_TEMPLATE([HAVE_PROC_OOM],
	    [Define this if you have a Linux-like /proc/.../oom_score_adj file
	    which can be adjusted by root to exempt us from the out-of-memory
	    .])

AH_TEMPLATE([HAVE_MOTIF],[Define this if you have Motif.])

AH_TEMPLATE([HAVE_XMCOMBOBOX],
	    [Define this if you have the XmComboBox Motif widget (Motif 2.0.)])

AH_TEMPLATE([HAVE_GTK],[Define this if you have Gtk (any version.)])
AH_TEMPLATE([HAVE_GTK2],[Define this if you have Gtk 2.x.])

AH_TEMPLATE([HAVE_CRAPPLET],
	    [Define this if you have Gnome and want to build support for the
	    xscreensaver control panel in the Gnome Control Center
	    (gnomecc).  (This is needed only with Gtk 1.x.)])

AH_TEMPLATE([HAVE_CRAPPLET_IMMEDIATE],
	    [Define this if HAVE_CRAPPLET is defined, and the function
	    capplet_widget_changes_are_immediate() is available.])

AH_TEMPLATE([HAVE_XML],[Define this if you have the XML library.])

AH_TEMPLATE([HAVE_OLD_XML_HEADERS],
	    [Define this if you have the XML library headers in their old,
	    non-namespaced location (you lack the gnome-xml/libxml symlink)])

AH_TEMPLATE([HAVE_GDK_PIXBUF],
	    [Define this if you have the GDK_Pixbuf library installed.  Some
	    of the demos can make use of this if it is available.])

AH_TEMPLATE([HAVE_GDK_PIXBUF_APPLY_EMBEDDED_ORIENTATION],
	    [Define this if you have the gdk_pixbuf_apply_embedded_orientation
	    function (gdk-pixbuf 2.12).])

AH_TEMPLATE([HAVE_JPEGLIB],
	    [Define this if you have the Independent JPEG Group's JPEG
	    library installed.  Some of the demos can make use of this if it
	    is available.])

AH_TEMPLATE([HAVE_LIBPNG],
	    [Define this if the Portable Network Graphics library is installed.
	    It is basically required, but many things will more-or-less limp
	    along without it.])

AH_TEMPLATE([HAVE_XMU],
	    [Define this if you have the Xmu library.  This is standard part
	    of X, and if your vendor doesn't ship it, you should report that
	    as a bug.])

AH_TEMPLATE([HAVE_XUTF8DRAWSTRING],
	    [Define this if you have the function Xutf8DrawString().])

AH_TEMPLATE([HAVE_XFT],
	    [Define this if you have libXft2.])

AH_TEMPLATE([HAVE_LIBSYSTEMD],
	    [Define this if you have libsystemd.])

AH_TEMPLATE([HAVE_GL],
	    [Define this if you have OpenGL.  Some of the demos require it,
	    so if you don't have it, then those particular demos won't be
	    built.  (This won't affect the screen saver as a whole.)])

AH_TEMPLATE([HAVE_MESA_GL],
	    [Define this if you have OpenGL, but it's the MesaGL variant. 
	    (The libraries have different names.) (HAVE_GL should be defined
	    too.)])

AH_TEMPLATE([HAVE_GLBINDTEXTURE],
	    [Define this if your version of OpenGL has the glBindTexture()
	    routine.  This is the case for OpenGL 1.1, but not for OpenGL
	    1.0.])

AH_TEMPLATE([HAVE_GLSL],
	    [Define this if your OpenGL implementation supports the OpenGL
            Shading Language (GLSL). This requires at least OpenGL 2.0.
            HAVE_GL should be defined, too.])

AH_TEMPLATE([HAVE_GLE],
	    [Define this if you have the -lgle and -lmatrix libraries (GL 
	    extrusion.)])

AH_TEMPLATE([HAVE_GLE3],[Define this if you have the -lgle from GLE version 3])

AH_TEMPLATE([HAVE_JWZGLES],[Define this to target the OpenGL ES 1.x API
	    instead of OpenGL 1.3.])

AH_TEMPLATE([HAVE_XSHM_EXTENSION],
	    [Define this if you have the X Shared Memory Extension.])

AH_TEMPLATE([HAVE_DOUBLE_BUFFER_EXTENSION],
	    [Define this if you have the X Double Buffer Extension.])

AH_TEMPLATE([FORTUNE_PROGRAM],
	    [Some screenhacks like to run an external program to generate
	    random pieces of text; set this to the one you like.  Note that
	    this is just the default; X resources can be used to override
	    it.])

AH_TEMPLATE([PASSWD_HELPER_PROGRAM],
	    [Set the name of the password helper program, if any])

AH_TEMPLATE([NO_LOCKING],
	    [Define this to remove the option of locking the screen at all.])

AH_TEMPLATE([ALLOW_ROOT_PASSWD],
	    [Define this to allow the root password to unlock the screen.])

AH_TEMPLATE([HAVE_KERBEROS],
	    [Define this if you want to use Kerberos authentication to
	    lock/unlock the screen instead of your local password.  This
	    currently uses Kerberos V4, but a V5 server with V4
	    compatibility will work.  WARNING: DO NOT USE AFS string-to-key
	    passwords with this option. This option currently *only* works
	    with standard Kerberos des_string_to_key.  If your password is
	    an AFS password and not a kerberos password, it will not
	    authenticate properly. See the comments in driver/kpasswd.c for
	    more information if you need it.])

AH_TEMPLATE([HAVE_KERBEROS5],
	    [Define this if you have Kerberos 5, meaning we need to use the
	    Kerberos 4 compatibility layer.])

AH_TEMPLATE([HAVE_PAM],
	    [Define this if you want to use PAM (Pluggable Authentication
	    Modules) to lock/unlock the screen, instead of standard
	    /etc/passwd authentication.])

AH_TEMPLATE([PAM_SERVICE_NAME],
	    [If PAM is being used, this is the name of the PAM service that
	    xscreensaver will authenticate as.  The default is
	    "xscreensaver", which means that the PAM library will look for
	    an "xscreensaver" line in /etc/pam.conf, or (on recent Linux
	    systems) will look for a file called /etc/pam.d/xscreensaver. 
	    Some systems might already have a PAM installation that is
	    configured for xlock, so setting this to "xlock" would also work
	    in that case.])

AH_TEMPLATE([HAVE_PAM_FAIL_DELAY],
	    [Define this if you have pam_fail_delay function.
	    see driver/passwd-pam.c.])

AH_TEMPLATE([PAM_CHECK_ACCOUNT_TYPE],
            [Whether PAM should check the result of account modules
	    when authenticating.  Only do this if you have account
	    configured properly on your system.])

AH_TEMPLATE([PAM_STRERROR_TWO_ARGS],
	    [Define if you have PAM and pam_strerror() requires two
	    arguments.])

AH_TEMPLATE([HAVE_SIGTIMEDWAIT],
	    [Define to 1 if you have the `sigtimedwait' function.])

AH_TEMPLATE([HAVE_SHADOW_PASSWD],
	    [Define this if your system uses 'shadow' passwords, that is, the
	    passwords live in /etc/shadow instead of /etc/passwd, and one
	    reads them with getspnam() instead of getpwnam().  (Note that
	    SCO systems do some random other thing; others might as well. 
	    See the ifdefs in driver/passwd-pwent.c if you're having trouble
	    related to reading passwords.)])

AH_TEMPLATE([HAVE_ENHANCED_PASSWD],
	    [Define this if your system is Digital or SCO Unix with so-called
	    ``Enhanced Security'', that is, the passwords live in
	    /tcb/files/auth/<x>/<xyz> instead of in /etc/passwd, and one
	    reads them with getprpwnam() instead of getpwnam().])

AH_TEMPLATE([HAVE_ADJUNCT_PASSWD],
	    [Define this if your system is Solaris with ``adjunct'' passwords
	    (this is the version where one gets at the passwords with
	    getpwanam() instead of getpwnam().) I haven't tested this one,
	    let me know if it works.])

AH_TEMPLATE([HAVE_HPUX_PASSWD],
	    [Define this if you have HPUX with so-called "Secure Passwords".])

AH_TEMPLATE([HAVE_SYSLOG],
	    [Define this if you the openlog(), syslog(), and closelog()
	    functions.  This is used for logging failed login attempts.])

AH_TEMPLATE([HAVE_ICMP],
	    [Define this if you do pings with a `struct icmp' and an
	     `icmp_id' slot.])

AH_TEMPLATE([HAVE_ICMPHDR],
	    [Define this if you do pings with a `struct icmphdr' and an
	     `un.echo.id' slot.])

AH_TEMPLATE([HAVE_GETIFADDRS],
	    [Define this if you have the getifaddrs() function.])

AH_TEMPLATE([HAVE_FORKPTY],
	    [Define this if you have the 'forkpty' function:
	     This allows 'phosphor' and 'apple2' to run curses-based
	     programs, or be used as terminal windows.])

AH_TEMPLATE([HAVE_GETTIMEOFDAY],
	    [Define this if you have the gettimeofday function.])

AH_TEMPLATE([GETTIMEOFDAY_TWO_ARGS],
	    [Define this if gettimeofday() takes two arguments.])

AH_TEMPLATE([XPointer],
	    [Define this to void* if you're using X11R4 or earlier.])

AH_TEMPLATE([HAVE_PTHREAD],
	    [Define this if your system supports POSIX threads.])

AH_TEMPLATE([HAVE_LIBCAP],
	    [Define this if your system has libcap.])

AH_TEMPLATE([HAVE_RECORD_ANIM],
	    [Define this to enable recording of videos.])

# After checking to see that --srcdir is correct (which AC_INIT does)
# check for some random other files that come later in the tar file,
# to make sure everything is here.
#
for d in utils jwxyz hacks hacks/glx driver ; do
  f=$srcdir/$d/Makefile.in
  if test \! -r $f ; then
    echo ""
    echo "ERROR: The package is incomplete: $f does not exist."
    echo "       This probably means that your download was truncated."
    echo ""
    exit 1
  fi
done

###############################################################################
#
#       Function to figure out how to run the compiler.
#
###############################################################################

AC_DEFUN([AC_PROG_CC_ANSI],
 [AC_REQUIRE([AC_PROG_CC])

  if test -z "$GCC"; then
    # not using GCC
    AC_MSG_CHECKING(how to request ANSI compilation)
    case "$host" in
      *-hpux* )
        AC_MSG_RESULT(HPUX: adding -Ae)
        CC="$CC -Ae"
      ;;
      *-aix* )
        AC_MSG_RESULT(AIX: adding -qlanglvl=ansi -qhalt=e)
        CC="$CC -qlanglvl=ansi -qhalt=e"
      ;;
      *-dec-* )
        AC_MSG_RESULT(DEC: adding -std1 -ieee)
        CC="$CC -std1"
      ;;
      *)
        AC_MSG_RESULT(no idea)
      ;;
    esac
  else
    # using GCC
    case "$host" in
      *-solaris*)
        AC_MSG_RESULT(Solaris: adding -D__EXTENSIONS__)
        CC="$CC -D__EXTENSIONS__"
      ;;
    esac
  fi

  OBJCC="$CC"

  # This test makes cross-compiling fail, so let's just assume that nobody
  # is using a K&R compiler any more...
  #
#  AC_MSG_CHECKING([whether the compiler works on ANSI C])
#  AC_TRY_RUN([ main(int ac, char **av) { return 0; } ],
#     AC_MSG_RESULT(yes),
#     AC_MSG_RESULT(no)
#     AC_MSG_ERROR(Couldn't build even a trivial ANSI C program: check CC.),
#     AC_MSG_ERROR(Couldn't build even a trivial ANSI C program: check CC.))

  if test -n "$GCC"; then
    AC_MSG_RESULT(Turning on gcc compiler warnings.)
    CC="$CC -pedantic -Wall -Wstrict-prototypes -Wnested-externs -Wmissing-prototypes"
    OBJCC="$OBJCC -Wall"
    # As of gcc 3.4, we have "-Wdeclaration-after-statement"
    # and so perhaps now we can do without -pedantic?
  else
    case "$host" in
      *-irix5* |*-irix6.[0-3]* )
        AC_MSG_RESULT(Turning on SGI compiler warnings.)
        CC="$CC -fullwarn -use_readonly_const -rdata_shared -g3"
      ;;
#     *-dec-osf* )
#       if test -z "$GCC"; then
#         AC_MSG_RESULT(Turning on DEC C compiler warnings.)
#         CC="$CC -migrate -w0 -verbose -warnprotos"
#       fi
#     ;;
    esac
  fi
])


###############################################################################
#
#       Check for availability of various gcc command-line options.
#
###############################################################################

AC_DEFUN([AC_CHECK_GCC_ARG],
 [if test -n "$GCC"; then
   AC_CACHE_CHECK([whether gcc accepts [$2]],
     ac_cv_gcc_accepts_[$1],
    [rm -rf conftest.$ac_ext
     touch conftest.$ac_ext
     if ( ( gcc -c [$2] conftest.$ac_ext -o/dev/null >/dev/null ) 2>&1 | \
          grep unrecognized >/dev/null ); then
       ac_cv_gcc_accepts_[$1]=no
     else
       ac_cv_gcc_accepts_[$1]=yes
       CC="$CC [$2]"
     fi])
   ac_gcc_accepts_[$1]="$ac_cv_gcc_accepts_[$1]"
  fi
])

AC_DEFUN([AC_NO_LONG_STRING_WARNINGS],
         [AC_CHECK_GCC_ARG(no_overlength, -Wno-overlength-strings)])

AC_DEFUN([AC_NO_MISPLACED_DECLARATIONS],
         [AC_CHECK_GCC_ARG(no_decl_after, -Wdeclaration-after-statement)])

# Need to disable Objective C extensions in ANSI C on MacOS X to work
# around an Apple-specific gcc bug.
#
AC_DEFUN([AC_NO_OBJECTIVE_C],
         [AC_CHECK_GCC_ARG(no_cpp_precomp, -no-cpp-precomp)])

###############################################################################
#
#       Function to figure out how to disable // comments in ANSI C code.
#
#       (With recent gcc, this is done with "-std=c89".  With older gcc, this
#       is done by passing "-lang-c89" to cpp, by passing "-Wp,-lang-c89" to
#       gcc.  Old gcc doesn't support -std, and new gcc doesn't support -lang.
#       so much for compatibility!)
#
#       UPDATE: apparently there is NO WAY to tell gcc 3.2.2 to require that
#       declarations preceed statements, without resorting to "-pedantic".
#       This means that there is no way to get gcc3 to issue warnings that
#       ensure that your code complies with the ANSI/ISO C89 standard, without
#       also drowning in totally useless warnings.  Thank you master may I
#       have another.
#
#       So, I give up, let's just use -pedantic.
#
###############################################################################

AC_DEFUN([AC_GCC_ACCEPTS_STD], [
  case "$host" in
    *-darwin* )
      # Fucking Apple let // comments sneak into OpenGL headers, so
      # we *must* allow // comments when compiling on Mac OS 10.6!  FUCK!
    ;;
   *)
     AC_CHECK_GCC_ARG(std, -std=c89)
   ;;
  esac
])

AC_DEFUN([AC_NO_CPLUSPLUS_COMMENTS_IN_C_CODE],
 [if test -n "$GCC"; then
   AC_GCC_ACCEPTS_STD
   AC_MSG_RESULT(Disabling C++ comments in ANSI C code.)
   #
   # The reason that // comments are banned from xscreensaver is that gcc is
   # basically the only compiler in the world that supports them in C code.
   # All other vendors support them only in their C++ compilers, not in their
   # ANSI C compilers.  This means that it's a portability problem: every time
   # these comments have snuck into the xscreensaver source code, I've gotten
   # complaints about it the next day.  So we turn off support for them in gcc
   # as well to prevent them from accidentially slipping in.
   #
   if test "$ac_gcc_accepts_std" = yes ; then
     #
     # -std=c89 defines __STRICT_ANSI__, which we don't want.
     # (That appears to be the only additional preprocessor symbol
     # it defines, in addition to the syntax changes it makes.)
     #
     # -std=gnu89 is no good, because // comments were a GNU extension
     # before they were in the ANSI C 99 spec...  (gcc 2.96 permits //
     # with -std=gnu89 but not with -std=c89.)
     #
     # $CC already contains "-std=c89" via AC_GCC_ACCEPTS_STD
     CC="$CC -U__STRICT_ANSI__"
#   else
#     # The old way:
#     CC="$CC -Wp,-lang-c89"
   fi
  fi
])


###############################################################################
#
#       Function to figure out how to create directory trees.
#
###############################################################################

AC_DEFUN([AC_PROG_INSTALL_DIRS],
 [AC_CACHE_CHECK([whether "\${INSTALL} -d" creates intermediate directories],
    ac_cv_install_d_creates_dirs,
    [ac_cv_install_d_creates_dirs=no
     rm -rf conftestdir
     if mkdir conftestdir; then
       cd conftestdir 2>/dev/null
       ${INSTALL} -d `pwd`/dir1/dir2 >/dev/null 2>&1
       if test -d dir1/dir2/. ; then
         ac_cv_install_d_creates_dirs=yes
       fi
       cd .. 2>/dev/null
       rm -rf conftestdir
     fi
    ])

  if test "$ac_cv_install_d_creates_dirs" = no ; then
    AC_CACHE_CHECK([whether "mkdir -p" creates intermediate directories],
      ac_cv_mkdir_p_creates_dirs,
      [ac_cv_mkdir_p_creates_dirs=no
       rm -rf conftestdir
       if mkdir conftestdir; then
         cd conftestdir 2>/dev/null
         mkdir -p dir1/dir2 >/dev/null 2>&1
         if test -d dir1/dir2/. ; then
           ac_cv_mkdir_p_creates_dirs=yes
         fi
         cd .. 2>/dev/null
         rm -rf conftestdir
       fi
      ])
  fi

  if test "$ac_cv_install_d_creates_dirs" = yes ; then
    INSTALL_DIRS='${INSTALL} -d'
  elif test "$ac_cv_mkdir_p_creates_dirs" = yes ; then
    INSTALL_DIRS='mkdir -p'
  else
    # any other ideas?
    INSTALL_DIRS='${INSTALL} -d'
  fi
])


###############################################################################
#
#       Function to check whether gettimeofday() exists, and how to call it.
#	This may define HAVE_GETTIMEOFDAY and GETTIMEOFDAY_TWO_ARGS.
#
###############################################################################

AC_DEFUN([AC_GETTIMEOFDAY_ARGS],
 [AC_MSG_CHECKING(how to call gettimeofday)
  AC_CACHE_VAL(ac_cv_gettimeofday_args,
   [AC_TRY_COMPILE([#include <stdlib.h>
                    #include <sys/time.h>],
                   [struct timeval tv; struct timezone tzp;
                    gettimeofday(&tv, &tzp);],
                   [ac_gettimeofday_args=2],
                   [AC_TRY_COMPILE([#include <stdlib.h>
                                    #include <sys/time.h>],
                                   [struct timeval tv; gettimeofday(&tv);],
                                   [ac_gettimeofday_args=1],
                                   [ac_gettimeofday_args=0])])
    ac_cv_gettimeofday_args=$ac_gettimeofday_args])
  ac_gettimeofday_args=$ac_cv_gettimeofday_args
  if test "$ac_gettimeofday_args" = 1 ; then
    AC_DEFINE(HAVE_GETTIMEOFDAY)
    AC_MSG_RESULT(one argument)
  elif test "$ac_gettimeofday_args" = 2 ; then
    AC_DEFINE(HAVE_GETTIMEOFDAY)
    AC_DEFINE(GETTIMEOFDAY_TWO_ARGS)
    AC_MSG_RESULT(two arguments)
  else
    AC_MSG_RESULT(unknown)
  fi
])


###############################################################################
#
#       Function to find perl5 (defines PERL and PERL_VERSION.)
#
###############################################################################

# M4 sucks!!  perl sucks too!!
changequote(X,Y)
perl_version_cmd='print $]'
changequote([,])

AC_DEFUN([AC_PROG_PERL],
 [AC_PATH_PROGS(PERL, [perl5 perl],,)
  if test -z "$PERL" ; then
    PERL_VERSION=0
  else
    AC_CACHE_CHECK([perl version], ac_cv_perl_version,
                   [ac_cv_perl_version=`$PERL -e "$perl_version_cmd"`])
    PERL_VERSION=$ac_cv_perl_version
  fi
 ])


###############################################################################
#
#       Function to demand "bc".  Losers.
#
###############################################################################

AC_DEFUN([AC_DEMAND_BC],
 [ac_bc_result=`echo 6+9 | bc 2>/dev/null`
  AC_MSG_CHECKING([for bc])
  if test "$ac_bc_result" = "15" ; then
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
    echo ''
    AC_MSG_ERROR([Your system doesn't have \"bc\", which has been a standard
                  part of Unix since the 1970s.  Come back when your vendor
                  has grown a clue.])
  fi
 ])

###############################################################################
#
#       Functions to check how to do ICMP PING requests.
#
###############################################################################

AC_DEFUN([AC_CHECK_ICMP],
 [AC_CACHE_CHECK([for struct icmp], ac_cv_have_icmp,
  [AC_TRY_COMPILE([#include <stdlib.h>
                   #include <stdio.h>
                   #include <math.h>
                   #include <unistd.h>
                   #include <limits.h>
                   #include <signal.h>
                   #include <fcntl.h>
                   #include <sys/types.h>
                   #include <sys/time.h>
                   #include <sys/ipc.h>
                   #include <sys/shm.h>
                   #include <sys/socket.h>
                   #include <netinet/in_systm.h>
                   #include <netinet/in.h>
                   #include <netinet/ip.h>
                   #include <netinet/ip_icmp.h>
                   #include <netinet/udp.h>
                   #include <arpa/inet.h>
                   #include <netdb.h>],
                  [struct icmp i;
                   struct sockaddr s;
                   struct sockaddr_in si;
                   struct ip ip;
                   i.icmp_type = ICMP_ECHO;
                   i.icmp_code = 0;
                   i.icmp_cksum = 0;
                   i.icmp_id = 0;
                   i.icmp_seq = 0;
                   si.sin_family = AF_INET;
                   #if defined(__DECC) || defined(_IP_VHL)
                   ip.ip_vhl = 0;
                   #else
                   ip.ip_hl = 0;
                   #endif
                   ],
                  [ac_cv_have_icmp=yes],
                  [ac_cv_have_icmp=no])])
 if test "$ac_cv_have_icmp" = yes ; then
   AC_DEFINE(HAVE_ICMP)
 fi])

AC_DEFUN([AC_CHECK_ICMPHDR],
 [AC_CACHE_CHECK([for struct icmphdr], ac_cv_have_icmphdr,
  [AC_TRY_COMPILE([#include <stdlib.h>
                   #include <stdio.h>
                   #include <math.h>
                   #include <unistd.h>
                   #include <limits.h>
                   #include <signal.h>
                   #include <fcntl.h>
                   #include <sys/types.h>
                   #include <sys/time.h>
                   #include <sys/ipc.h>
                   #include <sys/shm.h>
                   #include <sys/socket.h>
                   #include <netinet/in_systm.h>
                   #include <netinet/in.h>
                   #include <netinet/ip.h>
                   #include <netinet/ip_icmp.h>
                   #include <netinet/udp.h>
                   #include <arpa/inet.h>
                   #include <netdb.h>],
                  [struct icmphdr i;
                   struct sockaddr s;
                   struct sockaddr_in si;
                   struct ip ip;
                   i.type = ICMP_ECHO;
                   i.code = 0;
                   i.checksum = 0;
                   i.un.echo.id = 0;
                   i.un.echo.sequence = 0;
                   si.sin_family = AF_INET;
                   ip.ip_hl = 0;],
                  [ac_cv_have_icmphdr=yes],
                  [ac_cv_have_icmphdr=no])])
 if test "$ac_cv_have_icmphdr" = yes ; then
   AC_DEFINE(HAVE_ICMPHDR)
 fi])


###############################################################################
#
#       Functions to check for various X11 crap.
#
###############################################################################

# Try and find the app-defaults directory.
# It sucks that autoconf doesn't do this already...
#
AC_DEFUN([AC_PATH_X_APP_DEFAULTS_XMKMF],[
  rm -fr conftestdir
  if mkdir conftestdir; then
    cd conftestdir 2>/dev/null
    # Make sure to not put "make" in the Imakefile rules, since we grep it out.
    cat > Imakefile <<'EOF'
acfindx:
	@echo 'ac_x_app_defaults="${XAPPLOADDIR}"'
EOF
    if (xmkmf) >/dev/null 2>&1 && test -f Makefile; then
      # GNU make sometimes prints "make[1]: Entering...", which'd confuse us.
      eval `${MAKE-make} acfindx 2>/dev/null | grep -v make`
    fi
    cd .. 2>/dev/null
    rm -fr conftestdir
  fi])

AC_DEFUN([AC_PATH_X_APP_DEFAULTS_DIRECT],[
  # Look for the directory under a standard set of common directories.
  # Check X11 before X11Rn because it's often a symlink to the current release.
  for ac_dir in                                 \
                                                \
    /usr/share/X11/app-defaults                 \
                                                \
    /usr/X11/lib/app-defaults                   \
    /usr/X11R6/lib/app-defaults                 \
    /usr/X11R6/lib/X11/app-defaults             \
    /usr/X11R5/lib/app-defaults                 \
    /usr/X11R5/lib/X11/app-defaults             \
    /usr/X11R4/lib/app-defaults                 \
    /usr/X11R4/lib/X11/app-defaults             \
                                                \
    /usr/lib/X11/app-defaults                   \
    /usr/lib/X11R6/app-defaults                 \
    /usr/lib/X11R5/app-defaults                 \
    /usr/lib/X11R4/app-defaults                 \
                                                \
    /etc/X11/app-defaults                       \
                                                \
    /usr/local/X11/lib/app-defaults             \
    /usr/local/X11R6/lib/app-defaults           \
    /usr/local/X11R5/lib/app-defaults           \
    /usr/local/X11R4/lib/app-defaults           \
                                                \
    /usr/local/lib/X11/app-defaults             \
    /usr/local/lib/X11R6/app-defaults           \
    /usr/local/lib/X11R6/X11/app-defaults       \
    /usr/local/lib/X11R5/app-defaults           \
    /usr/local/lib/X11R5/X11/app-defaults       \
    /usr/local/lib/X11R4/app-defaults           \
    /usr/local/lib/X11R4/X11/app-defaults       \
                                                \
    /usr/X386/lib/X11/app-defaults              \
    /usr/x386/lib/X11/app-defaults              \
    /usr/XFree86/lib/X11/app-defaults           \
                                                \
    /usr/lib/X11/app-defaults                   \
    /usr/local/lib/X11/app-defaults             \
    /usr/unsupported/lib/X11/app-defaults       \
    /usr/athena/lib/X11/app-defaults            \
    /usr/local/x11r5/lib/X11/app-defaults       \
    /usr/lpp/Xamples/lib/X11/app-defaults       \
    /lib/usr/lib/X11/app-defaults               \
                                                \
    /usr/openwin/lib/app-defaults               \
    /usr/openwin/lib/X11/app-defaults           \
    /usr/openwin/share/lib/app-defaults         \
    /usr/openwin/share/lib/X11/app-defaults     \
                                                \
    /X11R6/lib/app-defaults                     \
    /X11R5/lib/app-defaults                     \
    /X11R4/lib/app-defaults                     \
    ; \
  do
    if test -d "$ac_dir"; then
      ac_x_app_defaults=$ac_dir
      break
    fi
  done
])

AC_DEFUN([AC_PATH_X_APP_DEFAULTS],
  [AC_REQUIRE_CPP()
    AC_CACHE_CHECK([for X app-defaults directory], ac_cv_x_app_defaults,
     [# skip this, it's always wrong these days.
      #  AC_PATH_X_APP_DEFAULTS_XMKMF
      if test x"$ac_x_app_defaults" = x; then
        true AC_PATH_X_APP_DEFAULTS_DIRECT
      fi
      if test x"$ac_x_app_defaults" = x; then
        /bin/echo -n 'fallback: '
        ac_cv_x_app_defaults="/usr/lib/X11/app-defaults"
      else
        # Record where we found app-defaults for the cache.
        ac_cv_x_app_defaults="$ac_x_app_defaults"
      fi])
    eval ac_x_app_defaults="$ac_cv_x_app_defaults"])


AC_DEFUN([AC_XPOINTER],
 [AC_CACHE_CHECK([for XPointer], ac_cv_xpointer,
                 [AC_TRY_X_COMPILE([#include <X11/Xlib.h>],
                                   [XPointer foo = (XPointer) 0;],
                                   [ac_cv_xpointer=yes],
                                   [ac_cv_xpointer=no])])
  if test "$ac_cv_xpointer" != yes; then
   AC_DEFINE(XPointer,[char*])
  fi])


# Random special-cases for X on certain pathological OSes.
# You know who you are.
#
AC_DEFUN([AC_X_RANDOM_PATHS],
 [case "$host" in
    *-hpux*)

      # The following arcana was gleaned from conversations with
      # Eric Schwartz <erics@col.hp.com>:
      #
      # On HPUX 10.x, the parts of X that HP considers "standard" live in
      # /usr/{include,lib}/X11R6/.  The parts that HP doesn't consider
      # "standard", notably, Xaw and Xmu, live in /usr/contrib/X11R6/.
      # Yet /usr/contrib/X11R6/ comes preinstalled on all HPUX systems.
      # Also, there are symlinks from /usr/include/ and /usr/lib/ into
      # /usr/{include,lib}/X11R6/, so that (if you don't use Xmu at all)
      # you don't need any -I or -L arguments.
      #
      # On HPUX 9.x, /usr/{include,lib}/X11R5/ and /usr/contrib/X11R5/
      # are the same division as 10.x.  However, there are no symlinks to
      # the X stuff from /usr/include/ and /usr/lib/, so -I and -L
      # arguments are always necessary.
      #
      # However, X11R6 was available on HPUX 9.x as a patch: if that
      # patch was installed, then all of X11R6 went in to
      # /usr/contrib/X11R6/ (there was no /usr/{include,lib}/X11R6/.)
      #
      # HPUX 8.x was the same as 9.x, but was X11R4 instead (I don't know
      # whether R5 was available as a patch; R6 undoubtedly was not.)
      #
      # So.  We try and use the highest numbered pair of
      # /usr/{include,lib}/X11R?/ and /usr/contrib/X11R?/{include,lib}/
      # that are available.  We do not mix and match different versions
      # of X.
      #
      # Question I still don't know the answer to: (do you?)
      #
      #   * On HPUX 9.x, where /usr/include/X11R5/ was standard, and
      #     /usr/contrib/X11R6/ could be installed as a patch, what was in
      #     that contrib directory?  Did it contain so-called "standard"
      #     X11R6, or did it include Xaw and Xmu as well?  If the former,
      #     where did one find Xaw and Xmu on 9.x R6 systems?  Would this
      #     be a situation where one had to reach into the R5 headers and
      #     libs to find Xmu?  That is, must both R6 and R5 directories
      #     be on the -I and -L lists in that case?
      #
      for version in X11R6 X11R5 X11R4 ; do
        # if either pair of directories exists...
        if test -d /usr/include/$version || test -d /usr/contrib/$version/include
        then
           # if contrib exists, use it...
           if test -d /usr/contrib/$version/include ; then
             X_CFLAGS="$X_CFLAGS -I/usr/contrib/$version/include"
             X_LIBS="$X_LIBS -L/usr/contrib/$version/lib"
           fi
           # if the "standard" one exists, use it.
           if test -d /usr/include/$version ; then
             X_CFLAGS="$X_CFLAGS -I/usr/include/$version"
             X_LIBS="$X_LIBS -L/usr/lib/$version"
           fi
           # since at least one of the pair exists, go no farther.
           break
        fi
      done

      # Now find Motif.  Thanks for not making xmkmf find this by
      # default, you losers.
      #
      if test -d /usr/include/Motif2.1 ; then
        X_CFLAGS="$X_CFLAGS -I/usr/include/Motif2.1"
        X_LIBS="$X_LIBS -L/usr/lib/Motif2.1"
      elif test -d /usr/include/Motif1.2 ; then
        X_CFLAGS="$X_CFLAGS -I/usr/include/Motif1.2"
        X_LIBS="$X_LIBS -L/usr/lib/Motif1.2"
      elif test -d /usr/include/Motif1.1 ; then
        X_CFLAGS="$X_CFLAGS -I/usr/include/Motif1.1"
        X_LIBS="$X_LIBS -L/usr/lib/Motif1.1"
      fi

      # Now let's check for the pseudo-standard locations for OpenGL.
      #
      if test -d /opt/graphics/OpenGL/include ; then
        # HP-UX 10.20 puts it here
        X_CFLAGS="-I/opt/graphics/OpenGL/include $X_CFLAGS"
        X_LIBS="-L/opt/graphics/OpenGL/lib $X_LIBS"
      elif test -d /opt/Mesa/lib ; then
        X_CFLAGS="-I/opt/Mesa/include $X_CFLAGS"
        X_LIBS="-L/opt/Mesa/lib $X_LIBS"
      fi


      # On HPUX, default to installing in /opt/xscreensaver/ instead of
      # in /usr/local/, unless there is already an xscreensaver in
      # /usr/local/bin/.  This can be overridden with the --prefix arg
      # to configure.  I'm not sure this is the right thing to do, but
      # Richard Lloyd says so...
      #
      if test \! -x /usr/local/bin/xscreensaver ; then
        ac_default_prefix=/opt/xscreensaver
      fi

    ;;
    *-solaris*)

      # Thanks for not making xmkmf find this by default, pinheads.
      # And thanks for moving things around again, too.  Is this
      # really the standard location now?  What happened to the
      # joke that this kind of thing went in /opt?
      # cthomp says "answer: CDE (Common Disorganized Environment)"
      #
      if test -f /usr/dt/include/Xm/Xm.h ; then
        X_CFLAGS="$X_CFLAGS -I/usr/dt/include"
        MOTIF_LIBS="$MOTIF_LIBS -L/usr/dt/lib -R/usr/dt/lib"

        # Some versions of Slowlaris Motif require -lgen.  But not all.  Why?
        AC_CHECK_LIB(gen, regcmp, [MOTIF_LIBS="$MOTIF_LIBS -lgen"])
      fi

    ;;
    *-darwin*)

      # On MacOS X (10.x with "fink"), many things are under /sw/.
      #
      if test -d /sw/include ; then
        X_CFLAGS="-I/sw/include $X_CFLAGS"
        X_LIBS="-L/sw/lib $X_LIBS"
      fi
    ;;
  esac])

AC_DEFUN([AC_CHECK_GETIFADDRS],
 [AC_CACHE_CHECK([for getifaddrs], ac_cv_have_getifaddrs,
  [AC_TRY_COMPILE([#include <stdlib.h>
                   #include <unistd.h>
                   #include <arpa/inet.h>
                   #include <ifaddrs.h>],
                  [struct ifaddrs *ifa;
                   getifaddrs (&ifa);
                   ifa->ifa_next = 0;
                   ifa->ifa_addr->sa_family = 0;],
                  [ac_cv_have_getifaddrs=yes],
                  [ac_cv_have_getifaddrs=no])])
 if test "$ac_cv_have_getifaddrs" = yes ; then
   AC_DEFINE(HAVE_GETIFADDRS)
 fi])

AC_DEFUN([AC_TYPE_SOCKLEN_T],
 [AC_CACHE_CHECK([for socklen_t], ac_cv_type_socklen_t,
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
   #include <sys/types.h>
   #include <sys/socket.h>]], [[
   socklen_t socklen;
   ]])],[ac_cv_type_socklen_t=yes],[ac_cv_type_socklen_t=no])])
  if test "$ac_cv_type_socklen_t" != yes; then
    AC_DEFINE(socklen_t, int,
  [Define to `int' if <sys/types.h> or <sys/socket.h> does not define.])
  fi])

###############################################################################
#
#       Some utility functions to make checking for X things easier.
#
###############################################################################

# Like AC_CHECK_HEADER, but it uses the already-computed -I directories.
#
AC_DEFUN([AC_CHECK_X_HEADER], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  if test \! -z "$includedir" ; then 
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
  CPPFLAGS=`eval eval eval eval eval eval eval eval eval echo $CPPFLAGS`
  AC_CHECK_HEADER([$1],[$2],[$3],[$4])
  CPPFLAGS="$ac_save_CPPFLAGS"])

# Like AC_EGREP_HEADER, but it uses the already-computed -I directories.
#
AC_DEFUN([AC_EGREP_X_HEADER], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  if test \! -z "$includedir" ; then 
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
  CPPFLAGS=`eval eval eval eval eval eval eval eval eval echo $CPPFLAGS`
  AC_EGREP_HEADER([$1], [$2], [$3], [$4])
  CPPFLAGS="$ac_save_CPPFLAGS"])

# Like AC_TRY_COMPILE, but it uses the already-computed -I directories.
#
AC_DEFUN([AC_TRY_X_COMPILE], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  if test \! -z "$includedir" ; then 
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
  CPPFLAGS=`eval eval eval eval eval eval eval eval eval echo $CPPFLAGS`
  AC_TRY_COMPILE([$1], [$2], [$3], [$4])
  CPPFLAGS="$ac_save_CPPFLAGS"])


# Like AC_CHECK_LIB, but it uses the already-computed -I and -L directories.
# Use this sparingly; it probably doesn't work very well on X programs.
#
AC_DEFUN([AC_CHECK_X_LIB], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  ac_save_LDFLAGS="$LDFLAGS"
#  ac_save_LIBS="$LIBS"

  if test \! -z "$includedir" ; then 
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi
  # note: $X_CFLAGS includes $x_includes
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"

  if test \! -z "$libdir" ; then
    LDFLAGS="$LDFLAGS -L$libdir"
  fi
  # note: $X_LIBS includes $x_libraries
  LDFLAGS="$LDFLAGS $X_LIBS $X_EXTRA_LIBS"

  CPPFLAGS=`eval eval eval eval eval eval eval eval eval echo $CPPFLAGS`
  LDFLAGS=`eval eval eval eval eval eval eval eval eval echo $LDFLAGS`
  AC_CHECK_LIB([$1], [$2], [$3], [$4], [$5])
  CPPFLAGS="$ac_save_CPPFLAGS"
  LDFLAGS="$ac_save_LDFLAGS"
#  LIBS="$ac_save_LIBS"
  ])

# Like AC_TRY_RUN, but it uses the already-computed -I directories.
# (But not the -L directories!)
#
AC_DEFUN([AC_TRY_X_RUN], [
  ac_save_CPPFLAGS="$CPPFLAGS"
  if test \! -z "$includedir" ; then 
    CPPFLAGS="$CPPFLAGS -I$includedir"
  fi
  CPPFLAGS="$CPPFLAGS $X_CFLAGS"
  CPPFLAGS=`eval eval eval eval eval eval eval eval eval echo $CPPFLAGS`
  AC_TRY_RUN([$1], [$2], [$3], [$4])
  CPPFLAGS="$ac_save_CPPFLAGS"])



# Usage: HANDLE_X_PATH_ARG([variable_name],
#                          [--command-line-option],
#                          [descriptive string])
#
# All of the --with options take three forms:
#
#   --with-foo (or --with-foo=yes)
#   --without-foo (or --with-foo=no)
#   --with-foo=/DIR
#
# This function, HANDLE_X_PATH_ARG, deals with the /DIR case.  When it sees
# a directory (string beginning with a slash) it checks to see whether
# /DIR/include and /DIR/lib exist, and adds them to $X_CFLAGS and $X_LIBS
# as appropriate.
#
AC_DEFUN([HANDLE_X_PATH_ARG], [
   case "$[$1]" in
    yes) ;;
    no)  ;;

    /*)
     AC_MSG_CHECKING([for [$3] headers])
     d=$[$1]/include
     if test -d $d; then
       X_CFLAGS="-I$d $X_CFLAGS"
       AC_MSG_RESULT($d)
     else
       AC_MSG_RESULT(not found ($d: no such directory))
     fi

     AC_MSG_CHECKING([for [$3] libs])
     d=$[$1]/lib
     if test -d $d; then
       X_LIBS="-L$d $X_LIBS"
       AC_MSG_RESULT($d)
     else
       AC_MSG_RESULT(not found ($d: no such directory))
     fi

     # replace the directory string with "yes".
     [$1]_req="yes"
     [$1]=$[$1]_req
     ;;

    *)
     echo ""
     echo "error: argument to [$2] must be \"yes\", \"no\", or a directory."
     echo "       If it is a directory, then \`DIR/include' will be added to"
     echo "       the -I list, and \`DIR/lib' will be added to the -L list."
     exit 1
     ;;
   esac
  ])


###############################################################################
###############################################################################
#
#       End of function definitions.  Now start actually executing stuff.
#
###############################################################################
###############################################################################

# WTF!  autoconf emits this *way* too late.  Do it earlier.
test "x$prefix" = xNONE && prefix=$ac_default_prefix
test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'

# random compiler setup
AC_CANONICAL_HOST

ac_original_cc=$CC
AC_PROG_CC
AC_PROG_CC_ANSI
AC_NO_LONG_STRING_WARNINGS
AC_NO_MISPLACED_DECLARATIONS
AC_NO_OBJECTIVE_C
AC_NO_CPLUSPLUS_COMMENTS_IN_C_CODE
AC_PROG_CPP
AC_C_CONST
AC_C_INLINE
AC_EXEEXT
AC_DEMAND_BC

# stuff for Makefiles
AC_PROG_INSTALL
AC_PROG_INSTALL_DIRS
AC_PROG_MAKE_SET

# By default, autoconf sets INSTALL_SCRIPT to '${INSTALL_PROGRAM}'.
# That's wrong: it should be set to '${INSTALL}', so that one can
# implement the "install-strip" target properly (strip executables,
# but do not try to strip scripts.)
#
INSTALL_SCRIPT='${INSTALL}'

# random libc stuff
AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h inttypes.h)
AC_TYPE_MODE_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_SIGNAL
AC_HEADER_TIME
AC_HEADER_SYS_WAIT
AC_HEADER_DIRENT
AC_GETTIMEOFDAY_ARGS
AC_SYS_LARGEFILE
AC_CHECK_FUNCS(select fcntl uname nice setpriority getcwd getwd putenv sbrk)
AC_CHECK_FUNCS(sigaction syslog realpath setrlimit)
AC_CHECK_FUNCS(setlocale sqrtf)
AC_CHECK_FUNCS(getaddrinfo)
AC_CHECK_MEMBERS([struct sockaddr.sa_len],,, [[#include <sys/socket.h>]])
AC_CHECK_ICMP
AC_CHECK_ICMPHDR
AC_CHECK_GETIFADDRS
AC_TYPE_SOCKLEN_T
AC_CHECK_HEADERS(crypt.h sys/select.h)
AC_PROG_PERL

if test -z "$PERL" ; then
  # don't let it be blank...
  PERL=/usr/bin/perl
fi

AC_PATH_XTRA

if test "$have_x" != yes; then
  AC_MSG_ERROR(Couldn't find X11 headers/libs.  Try `$0 --help'.)
fi

AC_X_RANDOM_PATHS
AC_XPOINTER

AC_MSG_CHECKING(whether this is MacOS X)
  ac_macosx=no
  ac_irix=no
  case "$host" in
    *-apple-darwin* )
      ac_macosx=yes
    ;;
    *-irix* )
      ac_irix=yes
    ;;
  esac
AC_MSG_RESULT($ac_macosx)


###############################################################################
#
#       pkg-config
#
###############################################################################

AC_PATH_TOOL(pkg_config, pkg-config)

if test -z "$pkg_config" ; then
  AC_MSG_WARN([pkg-config not found!])
  pkg_config="false"
fi


# Utility function for running pkg-config-based tests...
#
pkgs=''
pkg_check_version() {
  if test "$ok" = yes ; then
    req="$1"
    min="$2"
    AC_MSG_CHECKING(for $req)
    if $pkg_config --exists "$req" ; then
      vers=`$pkg_config --modversion "$req"`
      if $pkg_config --exists "$req >= $min" ; then
        AC_MSG_RESULT($vers)
        pkgs="$pkgs $req"
        return 1
      else
        AC_MSG_RESULT($vers (wanted >= $min))
        ok=no
        return 0
      fi
    else
      AC_MSG_RESULT(no)
      ok=no
      return 0
    fi
  fi
}


###############################################################################
#
#       Gettext support
#
###############################################################################

IT_PROG_INTLTOOL
GETTEXT_PACKAGE=xscreensaver
AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE",
		   [This is the name of the gettext package to use.])
AC_SUBST(GETTEXT_PACKAGE)

ALL_LINGUAS="da de es et fi fr hu it ja ko nb nl pl pt pt_BR ru sk sv vi wa zh_CN zh_TW"
AM_GLIB_GNU_GETTEXT
MKINSTALLDIRS="$INSTALL_DIRS"


###############################################################################
#
#       Check for -lXmu (some fucked up vendors don't ship it...)
#
###############################################################################

have_xmu=no
AC_CHECK_X_HEADER(X11/Xmu/Error.h, [have_xmu=yes],,
                  [#include <stdlib.h>
                   #include <stdio.h>
                   #include <X11/Intrinsic.h>])
if test "$have_xmu" = no ; then
  XMU_SRCS='$(UTILS_SRC)/xmu.c'
  XMU_OBJS='$(UTILS_BIN)/xmu.o'
  XMU_LIBS=''
else
  XMU_SRCS=''
  XMU_OBJS=''
  XMU_LIBS='-lXmu'
  AC_DEFINE(HAVE_XMU)
fi


###############################################################################
#
#       Check for the SunOS 4.1.x _get_wmShellWidgetClass bug.
#       See comp.windows.x FAQ question 124.  The right fix is to
#       get OpenWindows 3.0 patches 100512-02 and 100573-03.
#
###############################################################################

if test "$have_xmu" = yes ; then
  case "$host" in
    *-sunos4*)
    AC_CACHE_CHECK([for the SunOS 4.1.x _get_wmShellWidgetClass bug],
                   ac_cv_sunos_xmu_bug,
                   [ac_save_LDFLAGS="$LDFLAGS"
                    if test \! -z "$x_libraries" ; then
                      LDFLAGS="$LDFLAGS -L$x_libraries"
                    fi
                    # Note: this trick never works!  (Generally.)
                    # We're only getting away with using AC_TRY_LINK
                    # with X libraries because we know it's SunOS.
                    LDFLAGS="$LDFLAGS -lXmu -lXt -lX11 -lXext -lm"
                    AC_TRY_LINK(,,
                                [ac_cv_sunos_xmu_bug=no],
                                [ac_cv_sunos_xmu_bug=yes])
                    LDFLAGS="$ac_save_LDFLAGS"])
    if test "$ac_cv_sunos_xmu_bug" = yes ; then
      AC_CACHE_CHECK([whether the compiler understands -static], 
                     ac_cv_ld_static,
                     [ac_save_LDFLAGS="$LDFLAGS"
                      LDFLAGS="$LDFLAGS -static"
                      AC_TRY_LINK(,,[ac_cv_ld_static=yes],[ac_cv_ld_static=no])
                    LDFLAGS="$ac_save_LDFLAGS"])
      if test "$ac_cv_ld_static" = yes ; then
        LDFLAGS="$LDFLAGS -static"
      else
        LDFLAGS="$LDFLAGS -Bstatic"
      fi
    fi
    ;;
  esac
fi

###############################################################################
#
#       The --with-x-app-defaults option
#
###############################################################################

#### H1

AC_ARG_WITH(app-defaults,[
Installation Options:

  --prefix=PREFIX         Install root of architecture-independent files.
  --exec-prefix=EPREFIX   Install root of architecture-dependent files.
  --with-app-defaults=DIR Where to install the default settings file.],
	[ac_cv_x_app_defaults="$withval"],
	[eval ac_x_app_defaults="$withval"])
AC_PATH_X_APP_DEFAULTS


###############################################################################
#
#       Handle the --with-hackdir option
#
###############################################################################

have_hackdir=yes
with_hackdir_req=unspecified
AC_ARG_WITH(hackdir,
[  --with-hackdir=DIR      Where to install the hundreds of demo executables.],
  [with_hackdir="$withval"; with_hackdir_req="$withval"],[with_hackdir=yes])

if test x"$with_hackdir" = xyes; then
  HACKDIR='${libexecdir}/xscreensaver'
elif test x"$with_hackdir" = xno; then
  HACKDIR='${bindir}'
else
  HACKDIR=$with_hackdir
fi

# canonicalize slashes.
HACKDIR=`echo "${HACKDIR}" | sed 's@/$@@;s@//*@/@g'`

# Expand HACKDIR as HACKDIR_FULL
HACKDIR_FULL=`eval eval eval eval eval eval eval eval eval echo $HACKDIR`

# This option used to be called --enable-subdir; make sure that is no longer
# used, since configure brain-damagedly ignores unknown --enable options.

obsolete_enable=
AC_ARG_ENABLE(subdir,,[obsolete_enable=yes])
if test -n "$obsolete_enable"; then
  echo "error: the --enable-subdir option has been replaced with"
  echo "       the new --with-hackdir option; see \`configure --help'"
  echo "       for more information."
  exit 1
fi


###############################################################################
#
#       Handle the --with-configdir option
#
###############################################################################

have_configdir=yes
with_configdir_req=unspecified
AC_ARG_WITH(configdir,
[  --with-configdir=DIR    Where to install the GUI configuration files.],
  [with_configdir="$withval"; with_configdir_req="$withval"],
  [with_configdir=yes])

if test x"$with_configdir" = xyes; then
  HACK_CONF_DIR='${datadir}/xscreensaver/config'
elif test x"$with_configdir" = xno; then
  echo "error: must be yes, or a pathname: --with-configdir=$with_configdir"
  exit 1
else
  # there must be a better way than this...
  if test -z "`echo $with_configdir | sed 's@^/.*@@'`" ; then
    # absolute path
    HACK_CONF_DIR=$with_configdir
  else
    # relative path
    HACK_CONF_DIR="\${exec_prefix}$with_configdir"
  fi
fi



###############################################################################
#
#       Check for the DPMS server extension.
#
###############################################################################

#### H1

have_dpms=no
with_dpms_req=unspecified
AC_ARG_WITH(dpms-ext,
[
Server Extension Options:

  --with-dpms-ext         Include support for power management.],
  [with_dpms="$withval"; with_dpms_req="$withval"],[with_dpms=yes])

HANDLE_X_PATH_ARG(with_dpms, --with-dpms-ext, DPMS)

if test "$with_dpms" = yes; then

  # first check for dpms.h
  AC_CHECK_X_HEADER(X11/extensions/dpms.h, [have_dpms=yes],,
                    [#include <X11/Xlib.h>
		     #include <X11/Xmd.h>])

  # if that succeeded, then check for the DPMS code in the libraries
  if test "$have_dpms" = yes; then

    # first look in -lXext (this is where it is with XFree86 4.0)
    have_dpms=no
    AC_CHECK_X_LIB(Xext, DPMSInfo, [have_dpms=yes], [true], -lXext -lX11)

    # if that failed, look in -lXdpms (this is where it was in XFree86 3.x)
    if test "$have_dpms" = no; then
      AC_CHECK_X_LIB(Xdpms, DPMSInfo,
                    [have_dpms=yes; XDPMS_LIBS="-lXdpms"], [true],
                    -lXext -lX11)
    fi
  fi


  # if that succeeded, then we've really got it.
  if test "$have_dpms" = yes; then
    AC_DEFINE(HAVE_DPMS_EXTENSION)
  fi

elif test "$with_dpms" != no; then
  echo "error: must be yes or no: --with-dpms-ext=$with_dpms"
  exit 1
fi


###############################################################################
#
#       Check for the XF86VMODE server extension (for virtual screens.)
#
###############################################################################

have_xf86vmode=no
with_xf86vmode_req=unspecified
AC_ARG_WITH(xf86vmode-ext,
[  --with-xf86vmode-ext    Include support for virtual screens.],
  [with_xf86vmode="$withval"; with_xf86vmode_req="$withval"],
  [with_xf86vmode=yes])

HANDLE_X_PATH_ARG(with_xf86vmode, --with-xf86vmode-ext, xf86vmode)

VIDMODE_LIBS=""

if test "$with_xf86vmode" = yes; then

  # first check for xf86vmode.h
  AC_CHECK_X_HEADER(X11/extensions/xf86vmode.h, [have_xf86vmode=yes],,
                    [#include <X11/Xlib.h>])

  # if that succeeded, then check for the -lXxf86vm
  if test "$have_xf86vmode" = yes; then
    have_xf86vmode=no
    AC_CHECK_X_LIB(Xxf86vm, XF86VidModeGetViewPort,
                  [have_xf86vmode=yes;
                   VIDMODE_LIBS="-lXxf86vm";
                   SAVER_LIBS="$SAVER_LIBS $VIDMODE_LIBS"],
                   [true], -lXext -lX11)
  fi

  # if that succeeded, then we've really got it.
  if test "$have_xf86vmode" = yes; then
    AC_DEFINE(HAVE_XF86VMODE)
  fi

elif test "$with_xf86vmode" != no; then
  echo "error: must be yes or no: --with-xf86vmode-ext=$with_xf86vmode"
  exit 1
fi


###############################################################################
#
#       Check for the XINERAMA server extension.
#
###############################################################################

have_xinerama=no
with_xinerama_req=unspecified
AC_ARG_WITH(xinerama-ext,
[  --with-xinerama-ext     Include support for multiple monitors.],
  [with_xinerama="$withval"; with_xinerama_req="$withval"],[with_xinerama=yes])

HANDLE_X_PATH_ARG(with_xinerama, --with-xinerama-ext, XINERAMA)

if test "$with_xinerama" = yes; then

  # first check for Xinerama.h
  AC_CHECK_X_HEADER(X11/extensions/Xinerama.h, [have_xinerama=yes],,
                    [#include <X11/Xlib.h>])

  # if that succeeded, then check for the XINERAMA code in the libraries
  if test "$have_xinerama" = yes; then

    # first look in -lXext
    have_xinerama=no
    AC_CHECK_X_LIB(Xext, XineramaQueryScreens, [have_xinerama=yes], [true],
                  -lXext -lX11)

    # if that failed, look in -lXinerama (this is where it is in XFree86 4.1.)
    if test "$have_xinerama" = no; then
      AC_CHECK_X_LIB(Xinerama, XineramaQueryScreens,
                     [have_xinerama=yes; XINERAMA_LIBS="-lXinerama"],
                     [true], -lXext -lX11)
    fi
  fi

  # if that succeeded, then we've really got it.
  if test "$have_xinerama" = yes; then
    AC_DEFINE(HAVE_XINERAMA)
  fi

elif test "$with_xinerama" != no; then
  echo "error: must be yes or no: --with-xinerama-ext=$with_xinerama"
  exit 1
fi


###############################################################################
#
#       Check for the RANDR (Resize and Rotate) server extension.
#
#       We need this to detect when the resolution of the desktop
#       has changed out from under us (this is a newer, different
#       mechanism than the XF86VMODE virtual viewports.)
#
###############################################################################

have_randr=no
with_randr_req=unspecified
AC_ARG_WITH(randr-ext,
[  --with-randr-ext        Include different support for multiple monitors.],
  [with_randr="$withval"; with_randr_req="$withval"],[with_randr=yes])

HANDLE_X_PATH_ARG(with_randr, --with-randr-ext, RANDR)

if test "$with_randr" = yes; then

  # first check for Xrandr.h
  AC_CHECK_X_HEADER(X11/extensions/Xrandr.h, [have_randr=yes],,
                    [#include <X11/Xlib.h>])

  # if that succeeded, then check for the XRR code in the libraries
  if test "$have_randr" = yes; then

    # RANDR probably needs -lXrender
    xrender_libs=
    AC_CHECK_X_LIB(Xrender, XRenderSetSubpixelOrder,
                   [xrender_libs="-lXrender"], [true], -lXext -lX11)

    # first look for RANDR in -lXext
    have_randr=no
    AC_CHECK_X_LIB(Xext, XRRGetScreenInfo,
                   [have_randr=yes; SAVER_LIBS="$SAVER_LIBS $xrender_libs"],
                   [true], $xrender_libs -lXext -lX11)

    # if that failed, look in -lXrandr
    if test "$have_randr" = no; then
      AC_CHECK_X_LIB(Xrandr, XRRGetScreenInfo,
             [have_randr=yes; SAVER_LIBS="$SAVER_LIBS -lXrandr $xrender_libs"],
                     [true], $xrender_libs -lXext -lX11)
    fi
  fi

  # if that succeeded, then we've really got it.
  if test "$have_randr" = yes; then
    AC_DEFINE(HAVE_RANDR)

    # Now check for version 1.2 in the same libs.
    # Try to compile, since on MacOS 10.5.7, headers are older than libs!
    AC_CACHE_CHECK([for XRRGetScreenResources], ac_cv_randr_12,
      [ac_cv_randr_12=no
       AC_TRY_X_COMPILE([#include <stdlib.h>
                         #include <X11/Xlib.h>
                         #include <X11/extensions/Xrandr.h>],
                        [XRRScreenResources *res = 
                           XRRGetScreenResources (0, 0);],
                        [ac_cv_randr_12=yes],
                        [ac_cv_randr_12=no])])
    if test "$ac_cv_randr_12" = yes ; then
      AC_DEFINE(HAVE_RANDR_12)
    fi
#   AC_CHECK_X_LIB(c, XRRGetOutputInfo, [AC_DEFINE(HAVE_RANDR_12)],
#                  [true], $SAVER_LIBS)
  fi


elif test "$with_randr" != no; then
  echo "error: must be yes or no: --with-randr-ext=$with_randr"
  exit 1
fi


###############################################################################
#
#       Check for XF86MiscSetGrabKeysState (but only bother if we are already
#	using other XF86 stuff.)
#
###############################################################################

have_xf86miscsetgrabkeysstate=no
if test "$have_xf86gamma" = yes -o "$have_xf86vmode" = yes; then
  AC_CHECK_X_LIB(Xxf86misc, XF86MiscSetGrabKeysState,
                [have_xf86miscsetgrabkeysstate=yes],
                [true], -lXext -lX11)
  if test "$have_xf86miscsetgrabkeysstate" = yes ; then
    SAVER_LIBS="$SAVER_LIBS -lXxf86misc"
    AC_DEFINE(HAVE_XF86MISCSETGRABKEYSSTATE)
  fi
fi


###############################################################################
#
#       Check for the XINPUT server extension.
#
###############################################################################

have_xinput=no
with_xinput_req=unspecified
AC_ARG_WITH(xinput-ext,
[  --with-xinput-ext       Include support for the XInput extension.],
  [with_xinput="$withval"; with_xinput_req="$withval"], [with_xinput=yes])

HANDLE_X_PATH_ARG(with_xinput, --with-xinput-ext, XINPUT)

if test "$with_xinput" = yes; then

  # first check for Xinput.h
  AC_CHECK_X_HEADER(X11/extensions/XInput.h, [have_xinput=yes],,
                    [#include <X11/Xlib.h>])

  # if that succeeded, then check for libXi
  if test "$have_xinput" = yes; then
    have_xinput=no
    AC_CHECK_X_LIB(Xi, XListInputDevices,
                   [have_xinput=yes; SAVER_LIBS="$SAVER_LIBS -lXi"],
                   [true], -lXext -lX11)
  fi

  # if that succeeded, then we've really got it.
  if test "$have_xinput" = yes; then
    AC_DEFINE(HAVE_XINPUT)
  fi

elif test "$with_xinput" != no; then
  echo "error: must be yes or no: --with-xinput-ext=$with_xinput"
  exit 1
fi


###############################################################################
#
#       Check for the XF86VMODE server extension (for gamma fading.)
#
###############################################################################

have_xf86gamma=no
have_xf86gamma_ramp=no
with_xf86gamma_req=unspecified
AC_ARG_WITH(xf86gamma-ext,
[  --with-xf86gamma-ext    Include support for XFree86 gamma fading.],
  [with_xf86gamma="$withval"; with_xf86gamma_req="$withval"],
  [with_xf86gamma=yes])

HANDLE_X_PATH_ARG(with_xf86gamma, --with-xf86gamma-ext, xf86gamma)

if test "$with_xf86gamma" = yes; then

  # first check for xf86vmode.h, if we haven't already
  if test "$have_xf86vmode" = yes; then
    have_xf86gamma=yes
  else
    AC_CHECK_X_HEADER(X11/extensions/xf86vmode.h, [have_xf86gamma=yes],,
                      [#include <X11/Xlib.h>])
  fi

  # if that succeeded, then check for the -lXxf86vm
  if test "$have_xf86gamma" = yes; then
    have_xf86gamma=no
    AC_CHECK_X_LIB(Xxf86vm, XF86VidModeSetGamma,
                  [have_xf86gamma=yes],
                   [true], -lXext -lX11)
  fi

  # check for the Ramp versions of the functions too.
  if test "$have_xf86gamma" = yes; then
    have_xf86gamma_ramp=no
    AC_CHECK_X_LIB(Xxf86vm, XF86VidModeSetGammaRamp,
                  [have_xf86gamma_ramp=yes],
                   [true], -lXext -lX11)
  fi

  # if those tests succeeded, then we've really got the functions.
  if test "$have_xf86gamma" = yes; then
    AC_DEFINE(HAVE_XF86VMODE_GAMMA)
  fi

  if test "$have_xf86gamma_ramp" = yes; then
    AC_DEFINE(HAVE_XF86VMODE_GAMMA_RAMP)
  fi

  # pull in the lib, if we haven't already
  if test "$have_xf86gamma" = yes -a "$have_xf86vmode" = no; then
    SAVER_LIBS="$SAVER_LIBS -lXxf86vm"
  fi

elif test "$with_xf86gamma" != no; then
  echo "error: must be yes or no: --with-xf86gamma-ext=$with_xf86vmode"
  exit 1
fi


###############################################################################
#
#       Check for the XIDLE server extension.
#
###############################################################################

have_xidle=no
with_xidle_req=unspecified
AC_ARG_WITH(xidle-ext,
[  --with-xidle-ext        Include support for the X11R5 XIDLE extension.],
  [with_xidle="$withval"; with_xidle_req="$withval"],[with_xidle=yes])

HANDLE_X_PATH_ARG(with_xidle, --with-xidle-ext, XIDLE)

if test "$with_xidle" = yes; then
  AC_CHECK_X_HEADER(X11/extensions/xidle.h,
                    [have_xidle=yes
                     AC_DEFINE(HAVE_XIDLE_EXTENSION)],,
                    [#include <X11/Xlib.h>])
elif test "$with_xidle" != no; then
  echo "error: must be yes or no: --with-xidle-ext=$with_xidle"
  exit 1
fi


###############################################################################
#
#       Check for the MIT-SCREEN-SAVER server extension.
#
###############################################################################

have_mit=no
with_mit=no
with_mit_req=unspecified
#AC_ARG_WITH(mit-ext,
#[  --with-mit-ext          Include support for the MIT-SCREEN-SAVER extension.],
#  [with_mit="$withval"; with_mit_req="$withval"],[with_mit=no])
#HANDLE_X_PATH_ARG(with_mit, --with-mit-ext, MIT-SCREEN-SAVER)

if test "$with_mit" = yes; then
  AC_CHECK_X_HEADER(X11/extensions/scrnsaver.h, [have_mit=yes],,
                    [#include <X11/Xlib.h>])

  # Now check to see if it's really in the library; XF86Free-3.3 ships
  # scrnsaver.h, but doesn't include the code in libXext.a, the idiots!
  #
  if test "$have_mit" = yes; then
    AC_CHECK_X_LIB(Xext, XScreenSaverRegister, [true], [have_mit=no], -lm)

    if test "$have_mit" = no; then
      # Fuck!  Looks like XF86Free-3.3 actually puts it in XExExt instead
      # of in Xext.  Thank you master, may I have another.
      AC_CHECK_X_LIB(XExExt, XScreenSaverRegister,
                     [have_mit=yes; SAVER_LIBS="$SAVER_LIBS -lXExExt"],
                     [true], -lX11 -lXext -lm)
    fi

    if test "$have_mit" = no; then
      # Double fuck!  Looks like some versions of XFree86 (whichever version
      # it is that comes with RedHat Linux 2.0 -- I can't find a version 
      # number) put this garbage in Xss instead of Xext.  Thank you master,
      #  may I have another.
      AC_CHECK_X_LIB(Xss, XScreenSaverRegister,
                     [have_mit=yes; SAVER_LIBS="$SAVER_LIBS -lXss"],
                     [true], -lX11 -lXext -lm)
    fi

    if test "$have_mit" = yes; then
#     AC_DEFINE(HAVE_MIT_SAVER_EXTENSION)
      echo "Using the MIT-SCREEN-SAVER extension will crash your server. Don't."
      exit 1
    fi

  fi

elif test "$with_mit" != no; then
  echo "error: must be yes or no: --with-mit-ext=$with_mit"
  exit 1
fi


###############################################################################
#
#       Check for the SGI SCREEN_SAVER server extension.
#
###############################################################################

have_sgi=no
with_sgi_req=unspecified
AC_ARG_WITH(sgi-ext,
[  --with-sgi-ext          Include support for the SGI SCREEN_SAVER extension.],
  [with_sgi="$withval"; with_sgi_req="$withval"],[with_sgi=$ac_irix])

HANDLE_X_PATH_ARG(with_sgi, --with-sgi-ext, SGI SCREEN_SAVER)

if test "$with_sgi" = yes; then
  AC_CHECK_X_HEADER(X11/extensions/XScreenSaver.h,
                    [have_sgi=yes
                     AC_DEFINE(HAVE_SGI_SAVER_EXTENSION)],,
                    [#include <X11/Xlib.h>])

elif test "$with_sgi" != no; then
  echo "error: must be yes or no: --with-sgi-ext=$with_sgi"
  exit 1
fi


###############################################################################
#
#       Check for the SGI-VIDEO-CONTROL server extension.
#
###############################################################################

have_sgivc=no
with_sgivc_req=unspecified
AC_ARG_WITH(sgivc-ext,
[  --with-sgivc-ext        Include support for the SGI-VIDEO-CONTROL extension.],
  [with_sgivc="$withval"; with_sgivc_req="$withval"],[with_sgivc=$ac_irix])

HANDLE_X_PATH_ARG(with_sgivc, --with-sgivc-ext, SGI-VIDEO-CONTROL)

if test "$with_sgivc" = yes; then

  # first check for XSGIvc.h
  AC_CHECK_X_HEADER(X11/extensions/XSGIvc.h, [have_sgivc=yes],,
                    [#include <X11/Xlib.h>])

  # if that succeeded, then check for the -lXsgivc
  if test "$have_sgivc" = yes; then
    have_sgivc=no
    AC_CHECK_X_LIB(Xsgivc, XSGIvcQueryGammaMap,
                  [have_sgivc=yes; SAVER_LIBS="$SAVER_LIBS -lXsgivc"], [true],
                  -lXext -lX11)
  fi

  # if that succeeded, then we've really got it.
  if test "$have_sgivc" = yes; then
    AC_DEFINE(HAVE_SGI_VC_EXTENSION)
  fi

elif test "$with_sgivc" != no; then
  echo "error: must be yes or no: --with-sgivc-ext=$with_sgivc"
  exit 1
fi


###############################################################################
#
#       Check for the SGI XReadDisplay server extension.
#
###############################################################################

have_readdisplay=no
with_readdisplay_req=unspecified
AC_ARG_WITH(readdisplay,
[  --with-readdisplay      Include support for the SGI XReadDisplay extension.],
  [with_readdisplay="$withval"; with_readdisplay_req="$withval"],
  [with_readdisplay=$ac_irix])

HANDLE_X_PATH_ARG(with_readdisplay, --with-readdisplay, XReadDisplay)

if test "$with_readdisplay" = yes; then
  AC_CHECK_X_HEADER(X11/extensions/readdisplay.h,
                    AC_DEFINE(HAVE_READ_DISPLAY_EXTENSION),,
                    [#include <X11/Xlib.h>])
elif test "$with_readdisplay" != no; then
  echo "error: must be yes or no: --with-readdisplay=$with_readdisplay"
  exit 1
fi


###############################################################################
#
#       Check for the XSHM server extension.
#
###############################################################################

have_xshm=no
with_xshm_req=unspecified
AC_ARG_WITH(xshm-ext,
[  --with-xshm-ext         Include support for the Shared Memory extension.],
  [with_xshm="$withval"; with_xshm_req="$withval"],[with_xshm=yes])

HANDLE_X_PATH_ARG(with_xshm, --with-xshm-ext, XSHM)

if test "$with_xshm" = yes; then

  # first check for Xshm.h.
  AC_CHECK_X_HEADER(X11/extensions/XShm.h, [have_xshm=yes],,
                    [#include <X11/Xlib.h>])

  # if that succeeded, then check for sys/ipc.h.
  if test "$have_xshm" = yes; then
    have_xshm=no
    AC_CHECK_X_HEADER(sys/ipc.h, [have_xshm=yes])
  fi

  # if that succeeded, then check for sys/shm.h.
  if test "$have_xshm" = yes; then
    have_xshm=no
    AC_CHECK_X_HEADER(sys/shm.h, [have_xshm=yes])
  fi

  # AIX is pathological, as usual: apparently it's normal for the Xshm headers
  # to exist, but the library code to not exist.  And even better, the library
  # code is in its own library: libXextSam.a.  So, if we're on AIX, and that
  # lib doesn't exist, give up.  (This lib gets added to X_EXTRA_LIBS, and
  # that's not quite right, but close enough.)
  #
  case "$host" in
    *-aix*)
      if [ `uname -v` -eq 3 ]; then
        have_xshm=no
        AC_CHECK_X_LIB(XextSam, XShmQueryExtension,
                       [have_xshm=yes; X_EXTRA_LIBS="$X_EXTRA_LIBS -lXextSam"],
                       [true], -lX11 -lXext -lm)
      fi
    ;;
  esac

  # if that succeeded, then we've really got it.
  if test "$have_xshm" = yes; then
    AC_DEFINE(HAVE_XSHM_EXTENSION)
  fi

elif test "$with_xshm" != no; then
  echo "error: must be yes or no: --with-xshm-ext=$with_xshm"
  exit 1
fi


###############################################################################
#
#       Check for the DOUBLE-BUFFER server extension.
#
###############################################################################

have_xdbe=no
with_xdbe_req=unspecified
AC_ARG_WITH(xdbe-ext,
[  --with-xdbe-ext         Include support for the DOUBLE-BUFFER extension.],
  [with_xdbe="$withval"; with_xdbe_req="$withval"],[with_xdbe=yes])

HANDLE_X_PATH_ARG(with_xdbe, --with-xdbe-ext, DOUBLE-BUFFER)

if test "$with_xdbe" = yes; then

  AC_CHECK_X_HEADER(X11/extensions/Xdbe.h, [have_xdbe=yes],,
                    [#include <X11/Xlib.h>])
  if test "$have_xdbe" = yes; then
    AC_DEFINE(HAVE_DOUBLE_BUFFER_EXTENSION)    
  fi

elif test "$with_xdbe" != no; then
  echo "error: must be yes or no: --with-xdbe-ext=$with_xshm"
  exit 1
fi


###############################################################################
#
#       Check for HP XHPDisableReset and XHPEnableReset.
#
###############################################################################

AC_MSG_CHECKING([for XHPDisableReset in X11/XHPlib.h])
AC_EGREP_X_HEADER(XHPDisableReset, X11/XHPlib.h,
                  [AC_DEFINE(HAVE_XHPDISABLERESET)
                   SAVER_LIBS="-lXhp11 $SAVER_LIBS"
                   AC_MSG_RESULT(yes)],
                  [AC_MSG_RESULT(no)])


###############################################################################
#
#       Check for /proc/interrupts.
#
###############################################################################

have_proc_interrupts=no
with_proc_interrupts_req=unspecified
AC_ARG_WITH(proc-interrupts,
[  --with-proc-interrupts  Include support for consulting the /proc/interrupts
                          file to notice keyboard activity.],
  [with_proc_interrupts="$withval"; with_proc_interrupts_req="$withval"],
  [with_proc_interrupts=yes])

if test "$with_proc_interrupts" = yes; then

  # Note that we may be building in an environment (e.g. Debian buildd chroot)
  # without a proper /proc filesystem. If /proc/interrupts exists, then we'll
  # check that it has the bits we need, but otherwise we'll just go on faith.
  #
  have_proc_interrupts=yes

  if test -f /proc/interrupts; then
   AC_CACHE_CHECK([whether /proc/interrupts contains keyboard data],
    ac_cv_have_proc_interrupts,
    [ac_cv_have_proc_interrupts=no
     if grep 'keyboard\|i8042' /proc/interrupts >/dev/null 2>&1 ; then
       ac_cv_have_proc_interrupts=yes
     fi
    ])
   have_proc_interrupts=$ac_cv_have_proc_interrupts
  fi

  if test "$have_proc_interrupts" = yes; then
    AC_DEFINE(HAVE_PROC_INTERRUPTS)
  fi

elif test "$with_proc_interrupts" != no; then
  echo "error: must be yes or no: --with-proc-interrupts=$with_proc_interrupts"
  exit 1
fi


###############################################################################
#
#       Check for /proc/*/oom_score_adj.
#
###############################################################################

have_proc_oom=no
with_proc_oom_req=unspecified
AC_ARG_WITH(proc-oom,
[  --with-proc-oom         Include support for disabling the OOM-killer.],
  [with_proc_oom="$withval"; with_proc_oom_req="$withval"],
  [with_proc_oom=yes])

if test "$with_proc_oom_req" = yes; then

  # Note that we may be building in an environment (e.g. Debian buildd chroot)
  # without a proper /proc filesystem.
  #
  have_proc_oom=yes
  AC_DEFINE(HAVE_PROC_OOM)

elif test "$with_proc_oom_req" = unspecified; then

  have_proc_oom=no
  AC_CACHE_CHECK([whether /proc/$$/oom_score_adj exists],
    ac_cv_have_proc_oom,
    [ac_cv_have_proc_oom=no
     if test -f /proc/$$/oom_score_adj; then
       ac_cv_have_proc_oom=yes
     fi
    ])
  have_proc_oom=$ac_cv_have_proc_oom

  if test "$have_proc_oom" = yes; then
    AC_DEFINE(HAVE_PROC_OOM)
  fi

elif test "$with_proc_oom" != no; then
  echo "error: must be yes or no: --with-proc-oom=$with_proc_oom"
  exit 1
fi


###############################################################################
#
#       Check for -lsystemd
#
###############################################################################

have_systemd=no
with_systemd_req=unspecified
systemd_halfassed=no
systemd_too_old=no
AC_ARG_WITH(systemd,
[  --with-systemd          Support systemd requests to lock on suspend, and to
                          allow video players to inhibit the screen saver.],
  [with_systemd="$withval"; with_systemd_req="$withval"],
  [with_systemd=yes])

HANDLE_X_PATH_ARG(with_systemd, --with-systemd, systemd)

if test "$with_systemd" != yes -a "$with_systemd" != no ; then
  echo "error: must be yes or no: --with-systemd=$with_systemd"
  exit 1
fi

if test "$with_systemd" = yes; then

  pkgs=''
  ok="yes"
  pkg_check_version libsystemd 221
  have_systemd="$ok"

  if test "$have_systemd" = no; then
    if $pkg_config --exists libsystemd ; then
      systemd_too_old=yes
    fi
  fi

  if test "$have_systemd" = yes; then
    AC_CACHE_CHECK([for libsystemd includes], ac_cv_systemd_config_cflags,
               [ac_cv_systemd_config_cflags=`$pkg_config --cflags $pkgs`])
    AC_CACHE_CHECK([for libsystemd libs], ac_cv_systemd_config_libs,
               [ac_cv_systemd_config_libs=`$pkg_config --libs $pkgs`])
  fi

  ac_systemd_config_cflags=$ac_cv_systemd_config_cflags
  ac_systemd_config_libs=$ac_cv_systemd_config_libs

  if test "$have_systemd" = yes; then
    #
    # we appear to have libsystemd; check for headers/libs to be sure.
    #
    ac_save_systemd_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$CPPFLAGS $ac_systemd_config_cflags"

    have_systemd=no
    AC_CHECK_X_HEADER(systemd/sd-bus.h, [have_systemd=yes])

    CPPFLAGS="$ac_save_systemd_CPPFLAGS"
  fi

  if test "$have_systemd" = yes; then
    # we have the headers, now check for the libraries
    have_systemd=no
    systemd_halfassed=yes

    AC_MSG_RESULT(checking for libsystemd usability...)
    AC_CHECK_X_LIB(c, sd_bus_open_system, [have_systemd=yes],,
                   $ac_systemd_config_libs -lX11 -lXext -lm)
  fi

  if test "$have_systemd" = no; then
    AC_MSG_RESULT(checking for libsystemd usability... no)
  fi
fi

if test "$have_systemd" = yes; then
  INCLUDES="$INCLUDES $ac_systemd_config_cflags"
  EXES_SYSTEMD='$(EXES_SYSTEMD)'
  AC_DEFINE(HAVE_LIBSYSTEMD)
else
  EXES_SYSTEMD=''
fi


###############################################################################
#
#       The --enable-locking option
#
#	Note: "configure --help" list all "--enable" options before any
#	"--with" options, so we document the --enable options inline with
#	the --with options where it looks better, instead of in AC_ARG_ENABLE
#	where it would make sense, sigh...
#
###############################################################################

AC_ARG_ENABLE(locking,
[],  # This is documented elsewhere because of --enable/--with option sorting.
  [enable_locking="$enableval"],
  [if test "$ac_macosx" = yes; then
    # We can't lock on MacOS X, so default to not compiling in support for it.
    # But allow --enable-locking to override that, so I can debug Linux locking
    # under MacOS X11.
    enable_locking=no
   else
    enable_locking=yes
   fi])
if test "$enable_locking" = yes; then
  true
elif test "$enable_locking" = no; then
  AC_DEFINE(NO_LOCKING)
else
  echo "error: must be yes or no: --enable-locking=$enable_locking"
  exit 1
fi


##############################################################################
#
#       Whether to allow root password to unblank.
#
###############################################################################

AC_ARG_ENABLE(root-passwd,
[],  # This is documented elsewhere because of --enable/--with option sorting.
  [enable_root_passwd="$enableval"],[enable_root_passwd=yes])
if test "$enable_root_passwd" = yes; then
  AC_DEFINE(ALLOW_ROOT_PASSWD)
  true
elif test "$enable_root_passwd" != no; then
  echo "error: must be yes or no: --enable-root-passwd=$enable_root_passwd"
  exit 1
fi


###############################################################################
#
#       Check for PAM.
#
###############################################################################

case "$host" in
  *-solaris*)
   # Solaris systems tend to come with PAM misconfigured.
   #  Don't build it by default, even if the headers exist.
   with_pam_default=no
   ;;
  *)
   # Default to building PAM support on all other systems, if it exists.
   with_pam_default=yes
  ;;
esac

#### H1

have_pam=no
with_pam_req=unspecified

AC_ARG_WITH(pam,[
Screen Locking Options:

  --disable-locking       Do not allow locking of the display at all.
  --with-pam              Include support for PAM (Pluggable Auth Modules.)],
  [with_pam="$withval"; with_pam_req="$withval"],[with_pam=$with_pam_default])

AC_ARG_WITH([pam_service_name],
[  --with-pam-service-name Set the name of the xscreensaver PAM service.
  --enable-pam-account    Whether PAM should check the result of account
	    		  modules when authenticating.  Only do this if you
	    		  have "account" modules configured on your system.
  --enable-root-passwd	  Allow the root passwd to unlock, if not using PAM.],
  [pam_service_name="$withval"],[pam_service_name="xscreensaver"])

AC_ARG_ENABLE(pam-check-account-type,
[],  # This is documented elsewhere because of --enable/--with option sorting.
  [enable_pam_check_account_type="$enableval"],[enable_pam_check_account_type=no])
if test "$enable_pam_check_account_type" = yes ; then
  AC_DEFINE(PAM_CHECK_ACCOUNT_TYPE)
  true
elif test "$enable_pam_check_account_type" != no ; then
  echo "error: must be yes or no: --enable-pam-check-account-type=$enable_pam_check_account_type"
  exit 1
fi

HANDLE_X_PATH_ARG(with_pam, --with-pam, PAM)

if test "$enable_locking" = yes -a "$with_pam" = yes; then
  AC_CACHE_CHECK([for PAM], ac_cv_pam,
                 [AC_TRY_X_COMPILE([#include <security/pam_appl.h>],,
                                   [ac_cv_pam=yes],
                                   [ac_cv_pam=no])])
  if test "$ac_cv_pam" = yes ; then
    have_pam=yes
    AC_DEFINE(HAVE_PAM)
    AC_DEFINE_UNQUOTED(PAM_SERVICE_NAME,"$pam_service_name")
    
    PASSWD_LIBS="${PASSWD_LIBS} -lpam"

    # libpam typically requires dlopen and dlsym.  On FreeBSD,
    # those are in libc.  On Linux and Solaris, they're in libdl.
    AC_CHECK_LIB(dl, dlopen, [PASSWD_LIBS="${PASSWD_LIBS} -ldl"])

    # On Linux, sigtimedwait() is in libc; on Solaris, it's in librt.
    have_timedwait=no
    AC_CHECK_LIB(c, sigtimedwait,
                 [have_timedwait=yes
                  AC_DEFINE(HAVE_SIGTIMEDWAIT)])
    if test "$have_timedwait" = no ; then
      AC_CHECK_LIB(rt, sigtimedwait, [have_timedwait=yes
                                      AC_DEFINE(HAVE_SIGTIMEDWAIT)
                                      PASSWD_LIBS="${PASSWD_LIBS} -lrt"])
    fi

    AC_MSG_CHECKING(how to call pam_strerror)
    AC_CACHE_VAL(ac_cv_pam_strerror_args,
     [AC_TRY_X_COMPILE([#include <stdio.h>
                        #include <stdlib.h>
                        #include <security/pam_appl.h>],
                       [pam_handle_t *pamh = 0;
                        char *s = pam_strerror(pamh, PAM_SUCCESS);],
                       [ac_pam_strerror_args=2],
                       [AC_TRY_X_COMPILE([#include <stdio.h>
                                          #include <stdlib.h>
                                          #include <security/pam_appl.h>],
                                         [char *s =
                                           pam_strerror(PAM_SUCCESS);],
                                         [ac_pam_strerror_args=1],
                                         [ac_pam_strerror_args=0])])
      ac_cv_pam_strerror_args=$ac_pam_strerror_args])
    ac_pam_strerror_args=$ac_cv_pam_strerror_args
    if test "$ac_pam_strerror_args" = 1 ; then
      AC_MSG_RESULT(one argument)
    elif test "$ac_pam_strerror_args" = 2 ; then
      AC_DEFINE(PAM_STRERROR_TWO_ARGS)
      AC_MSG_RESULT(two arguments)
    else
      AC_MSG_RESULT(unknown)
    fi

# Check pam_fail_delay
    AC_MSG_CHECKING(pam_fail_delay in -lpam)
    AC_CACHE_VAL(ac_cv_pam_fail_delay,
     [ac_save_LDFLAGS="$LDFLAGS"
      LDFLAGS="-lpam"
      AC_TRY_LINK([#include <security/pam_appl.h>],
                  [pam_handle_t *pamh = 0;
		   unsigned int usec = 1;
		   int status = pam_fail_delay (pamh, usec);],
                  [ac_pam_fail_delay=yes],
                  [ac_pam_fail_delay=no])
      ac_cv_pam_fail_delay=$ac_pam_fail_delay,
      LDFLAGS=$ac_save_LDFLAGS])

      if test "$ac_pam_fail_delay" = yes ; then
        AC_MSG_RESULT(yes)
        AC_DEFINE(HAVE_PAM_FAIL_DELAY)
      else
        AC_MSG_RESULT(no)
      fi

  fi
fi


###############################################################################
#
#       Check for Kerberos.
#
###############################################################################

have_kerberos=no
have_kerberos5=no
with_kerberos_req=unspecified

AC_ARG_WITH(kerberos, 
[  --with-kerberos         Include support for Kerberos authentication.],
  [with_kerberos="$withval"; with_kerberos_req="$withval"],[with_kerberos=yes])

HANDLE_X_PATH_ARG(with_kerberos, --with-kerberos, Kerberos)

if test "$enable_locking" = yes -a "$with_kerberos" = yes; then
  AC_CACHE_CHECK([for Kerberos 4], ac_cv_kerberos,
                 [AC_TRY_X_COMPILE([#include <krb.h>],,
                                   [ac_cv_kerberos=yes],
                                   [ac_cv_kerberos=no])])
  AC_CACHE_CHECK([for Kerberos 5], ac_cv_kerberos5,
                 [AC_TRY_X_COMPILE([#include <kerberosIV/krb.h>],,
                                   [ac_cv_kerberos5=yes],
                                   [ac_cv_kerberos5=no])])

  if test "$ac_cv_kerberos" = yes ; then
    have_kerberos=yes
    AC_DEFINE(HAVE_KERBEROS)
  fi

  if test "$ac_cv_kerberos5" = yes ; then

    # Andrew Snare <ajs@pigpond.com> wrote:
    #
    # You were assuming that if kerberosV (krb5) was found, then kerberosIV
    # (krb4) was also available.  This turns out not to be the case with
    # mit-krb-1.2.7; apparently backwards-compatibility with KerberosIV
    # is optional.
    #
    # So, disable kerberosV support if libkrb4 can't be found.
    # This is not the best solution, but it makes the compile not fail.
    #
    AC_CHECK_X_LIB(krb4, krb_get_tf_realm,
                   [have_kerberos=yes],
                   [have_kerberos=no])
    if test "$have_kerberos" = yes ; then
      have_kerberos5=yes
      AC_DEFINE(HAVE_KERBEROS)
      AC_DEFINE(HAVE_KERBEROS5)
    else
      have_kerberos5=no
      AC_MSG_WARN([Cannot find compat lib (libkrb4) needed to use Kerberos 5])
    fi

  fi

  if test "$have_kerberos5" = yes ; then
    # from Matt Knopp <mhat@infocalypse.netlag.com>
    # (who got it from amu@mit.edu)

    PASSWD_LIBS="$PASSWD_LIBS -lkrb4 -ldes425 -lkrb5 -lk5crypto -lcom_err"

    # jwz: MacOS X uses -lkrb5, but not -lcrypt
    AC_CHECK_X_LIB(crypt, crypt, [PASSWD_LIBS="$PASSWD_LIBS -lcrypt"])

  elif test "$have_kerberos" = yes ; then
    # from Tim Showalter <tjs@psaux.com> for FreeBSD 4.2
    PASSWD_LIBS="$PASSWD_LIBS -lkrb -ldes -lcom_err"
  fi

  if test "$have_kerberos" = yes ; then
    AC_CHECK_FUNC(res_search,,
      AC_CHECK_LIB(resolv,res_search,PASSWD_LIBS="${PASSWD_LIBS} -lresolv",
        AC_MSG_WARN([Can't find DNS resolver libraries needed for Kerberos])
      ))
  fi
fi


###############################################################################
#
#       Check for the nine billion variants of shadow passwords...
#
###############################################################################

need_setuid=no

have_shadow=no
with_shadow_req=unspecified

AC_ARG_WITH(shadow,
[  --with-shadow           Include support for shadow password authentication.],
  [with_shadow="$withval"; with_shadow_req="$withval"],[with_shadow=yes])

HANDLE_X_PATH_ARG(with_shadow, --with-shadow, shadow password)

if test "$enable_locking" = no ; then
  with_shadow_req=no
  with_shadow=no
fi


###############################################################################
#
#       Check for Sun "adjunct" passwords.
#
###############################################################################

if test "$with_shadow" = yes ; then
  AC_CACHE_CHECK([for Sun-style shadow passwords], ac_cv_sun_adjunct,
                 [AC_TRY_X_COMPILE([#include <stdlib.h>
                                    #include <unistd.h>
                                    #include <sys/types.h>
                                    #include <sys/label.h>
                                    #include <sys/audit.h>
                                    #include <pwdadj.h>],
                      [struct passwd_adjunct *p = getpwanam("nobody");
                       const char *pw = p->pwa_passwd;],
                      [ac_cv_sun_adjunct=yes],
                      [ac_cv_sun_adjunct=no])])
  if test "$ac_cv_sun_adjunct" = yes; then
    have_shadow_adjunct=yes
    have_shadow=yes
    need_setuid=yes
  fi
fi


###############################################################################
#
#       Check for DEC and SCO so-called "enhanced" security.
#
###############################################################################

if test "$with_shadow" = yes ; then
  AC_CACHE_CHECK([for DEC-style shadow passwords], ac_cv_enhanced_passwd,
                 [AC_TRY_X_COMPILE([#include <stdlib.h>
                                    #include <unistd.h>
                                    #include <sys/types.h>
                                    #include <pwd.h>
                                    #include <sys/security.h>
                                    #include <prot.h>],
                      [struct pr_passwd *p;
                       const char *pw;
                       set_auth_parameters(0, 0);
                       check_auth_parameters();
                       p = getprpwnam("nobody");
                       pw = p->ufld.fd_encrypt;],
                      [ac_cv_enhanced_passwd=yes],
                      [ac_cv_enhanced_passwd=no])])
  if test $ac_cv_enhanced_passwd = yes; then
    have_shadow_enhanced=yes
    have_shadow=yes
    need_setuid=yes

    # On SCO, getprpwnam() is in -lprot (which uses nap() from -lx)
    # (I'm told it needs -lcurses too, but I don't understand why.)
    # But on DEC, it's in -lsecurity.
    #
    AC_CHECK_LIB(prot, getprpwnam, 
                 [PASSWD_LIBS="$PASSWD_LIBS -lprot -lcurses -lx"],
                 [AC_CHECK_LIB(security, getprpwnam, 
                               [PASSWD_LIBS="$PASSWD_LIBS -lsecurity"])],
                 [-lx])
  fi
fi

###############################################################################
#
#       Check for HP's entry in the "Not Invented Here" Sweepstakes.
#
###############################################################################

if test "$with_shadow" = yes ; then
  AC_CACHE_CHECK([for HP-style shadow passwords], ac_cv_hpux_passwd,
                 [AC_TRY_X_COMPILE([#include <stdlib.h>
                                    #include <unistd.h>
                                    #include <sys/types.h>
                                    #include <pwd.h>
                                    #include <hpsecurity.h>
                                    #include <prot.h>],
                      [struct s_passwd *p = getspwnam("nobody");
                       const char *pw = p->pw_passwd;],
                      [ac_cv_hpux_passwd=yes],
                      [ac_cv_hpux_passwd=no])])
  if test "$ac_cv_hpux_passwd" = yes; then
    have_shadow_hpux=yes
    have_shadow=yes
    need_setuid=yes

    # on HPUX, bigcrypt is in -lsec
    AC_CHECK_LIB(sec, bigcrypt, [PASSWD_LIBS="$PASSWD_LIBS -lsec"])
  fi
fi


###############################################################################
#
#       Check for FreeBSD-style shadow passwords.
#
#       On FreeBSD, getpwnam() and friends work just like on non-shadow-
#       password systems -- except you only get stuff in the pw_passwd field
#       if the running program is setuid.  So, guess that we've got this
#       lossage to contend with if /etc/master.passwd exists, and default to
#       a setuid installation.
#
###############################################################################

if test "$with_shadow" = yes ; then
  AC_CACHE_CHECK([for FreeBSD-style shadow passwords], ac_cv_master_passwd,
                 [if test -f /etc/master.passwd ; then
                    ac_cv_master_passwd=yes
                  else
                    ac_cv_master_passwd=no
                  fi])
  if test "$ac_cv_master_passwd" = yes; then
    need_setuid=yes
  fi
fi


###############################################################################
#
#       Check for traditional (ha!) shadow passwords.
#
###############################################################################

if test "$with_shadow" = yes ; then
  AC_CACHE_CHECK([for generic shadow passwords], ac_cv_shadow,
                 [AC_TRY_X_COMPILE([#include <stdlib.h>
                                    #include <unistd.h>
                                    #include <sys/types.h>
                                    #include <pwd.h>
                                    #include <shadow.h>],
                      [struct spwd *p = getspnam("nobody");
                       const char *pw = p->sp_pwdp;],
                      [ac_cv_shadow=yes],
                      [ac_cv_shadow=no])])
  if test "$ac_cv_shadow" = yes; then
    have_shadow=yes
    need_setuid=yes

    # On some systems (UnixWare 2.1), getspnam() is in -lgen instead of -lc.
    have_getspnam=no
    AC_CHECK_LIB(c, getspnam, [have_getspnam=yes])
    if test "$have_getspnam" = no ; then
      AC_CHECK_LIB(gen, getspnam,
                   [have_getspnam=yes; PASSWD_LIBS="$PASSWD_LIBS -lgen"])
    fi
  fi
fi


###############################################################################
#
#       Check for other libraries needed for non-shadow passwords.
#
###############################################################################

if test "$enable_locking" = yes ; then

  # On some systems (UnixWare 2.1), crypt() is in -lcrypt instead of -lc.
  have_crypt=no
  AC_CHECK_LIB(c, crypt, [have_crypt=yes])
  if test "$have_crypt" = no ; then
    AC_CHECK_LIB(crypt, crypt,
                 [have_crypt=yes; PASSWD_LIBS="$PASSWD_LIBS -lcrypt"])
  fi
fi


# Most of the above shadow mechanisms will have set need_setuid to yes,
# if they were found.  But, on some systems, we need setuid even when
# using plain old vanilla passwords.
#
if test "$enable_locking" = yes ; then
  case "$host" in
    *-hpux* | *-aix* | *-netbsd* | *-freebsd* | *-openbsd* )
      need_setuid=yes
    ;;
  esac
fi


if test "$have_shadow_adjunct" = yes ; then
  AC_DEFINE(HAVE_ADJUNCT_PASSWD)
elif test "$have_shadow_enhanced" = yes ; then
  AC_DEFINE(HAVE_ENHANCED_PASSWD)
elif test "$have_shadow_hpux" = yes ; then
  AC_DEFINE(HAVE_HPUX_PASSWD)
elif test "$have_shadow" = yes ; then
  AC_DEFINE(HAVE_SHADOW_PASSWD)
fi


###############################################################################
#
#       Check for external password helper
#	On SuSE, instead of having xscreensaver be a setuid program, they
#	fork an external program that takes the password on stdin, and
#	returns true if that password is a valid one.  Then only that
#	smaller program needs to be setuid.
#
#       (Note that this external program is not a GUI: the GUI is still
#	all in xscreensaver itself; the external program just does auth.)
#
###############################################################################

have_passwd_helper=no
with_passwd_helper_req=unspecified

AC_ARG_WITH(passwd-helper,
[  --with-passwd-helper    Include support for an external password
                          verification helper program.],
  [with_passwd_helper="$withval"; with_passwd_helper_req="$withval"],[with_passwd_helper=no])
# no HANDLE_X_PATH_ARG for this one

if test "$enable_locking" = no ; then
  with_passwd_helper_req=no
  with_passwd_helper=no
fi

case "$with_passwd_helper" in
  ""|no) : ;;
  /*)
    AC_DEFINE_UNQUOTED(PASSWD_HELPER_PROGRAM, "$with_passwd_helper")
    have_passwd_helper=yes;;
  *)
    echo "error: --with-passwd-helper needs full pathname of helper (not '$with_passwd_helper')." >&2
    exit 1
esac



###############################################################################
#
#       Check for -lgtk (and Gnome stuff)
#
###############################################################################

#### H1

have_gtk=no
with_gtk_req=unspecified
AC_ARG_WITH(gtk,
[
User Interface Options:

  --with-gtk              Use the Gtk toolkit for the user interface.],
  [with_gtk="$withval"; with_gtk_req="$withval"],[with_gtk=yes])

# if --with-gtk=/directory/ was specified, remember that directory so that
# we can also look for the `gtk-config' program in that directory.
case "$with_gtk" in
  /*)
    gtk_dir="$with_gtk"
    ;;
  *)
    gtk_dir=""
    ;;
esac

HANDLE_X_PATH_ARG(with_gtk, --with-gtk, Gtk)

if test "$with_gtk" != yes -a "$with_gtk" != no ; then
  echo "error: must be yes or no: --with-gtk=$with_gtk"
  exit 1
fi


parse_gtk_version_string() {
  # M4 sucks!!
  changequote(X,Y)
  maj=`echo $ac_gtk_version_string | sed -n 's/\..*//p'`
  min=`echo $ac_gtk_version_string | sed -n 's/[^.]*\.\([^.]*\).*/\1/p'`
  changequote([,])
  ac_gtk_version=`echo "$maj * 1000 + $min" | bc`
  if test -z "$ac_gtk_version"; then
    ac_gtk_version=unknown
    ac_gtk_version_string=unknown
  fi
}

jurassic_gtk=no
gtk_halfassed=no

if test "$with_gtk" = yes; then
  have_gtk=no
  
  ok="yes"
  pkg_check_version            gtk+-2.0  2.22.0 ; ac_gtk_version_string="$vers"
  pkg_check_version         gmodule-2.0  2.0.0
  pkg_check_version          libxml-2.0  2.4.6
  pkg_check_version      gdk-pixbuf-2.0  2.0.0
  pkg_check_version gdk-pixbuf-xlib-2.0  2.0.0
  have_gtk="$ok"

  if test "$have_gtk" = no; then
    if test -n "$ac_gtk_version_string" ; then
      gtk_halfassed="$ac_gtk_version_string"
      gtk_halfassed_lib="$req"
    fi
  fi

  if test "$have_gtk" = yes; then
    parse_gtk_version_string
    jurassic_gtk=no
  fi

  if test "$have_gtk" = yes; then
    AC_CACHE_CHECK([for Gtk includes], ac_cv_gtk_config_cflags,
                   [ac_cv_gtk_config_cflags=`$pkg_config --cflags $pkgs`])
    AC_CACHE_CHECK([for Gtk libs], ac_cv_gtk_config_libs,
                   [ac_cv_gtk_config_libs=`$pkg_config --libs $pkgs`])
  fi

  ac_gtk_config_cflags=$ac_cv_gtk_config_cflags
  ac_gtk_config_libs=$ac_cv_gtk_config_libs

  GTK_EXTRA_OBJS=""
  GTK_DATADIR=""
  if test "$have_gtk" = yes; then
    GTK_DATADIR=`$pkg_config --variable=prefix gtk+-2.0`
    GTK_DATADIR="$GTK_DATADIR/share"
  fi

  if test "$have_gtk" = yes; then
    INCLUDES="$INCLUDES $ac_gtk_config_cflags"
    GTK_LIBS="$GTK_LIBS $ac_gtk_config_libs"
    AC_DEFINE(HAVE_GTK)
    AC_DEFINE(HAVE_GTK2)
    AC_DEFINE(HAVE_XML)
  fi
fi


# Check for the various Gnome help and URL loading programs.
#
WITH_BROWSER=gnome-open
if test "$have_gtk" = yes; then
  AC_CHECK_PROGS(gnome_open_program,     gnome-open)
  AC_CHECK_PROGS(gnome_url_show_program, gnome-url-show)
fi


###############################################################################
#
#       Check for -lXm.
#
###############################################################################

have_motif=no
with_motif_req=unspecified
AC_ARG_WITH(motif,
[  --with-motif            Use the Motif toolkit for the user interface.],
  [with_motif="$withval"; with_motif_req="$withval"],[with_motif=no])

HANDLE_X_PATH_ARG(with_motif, --with-motif, Motif)

if test "$with_motif" != yes -a "$with_motif" != no ; then
  echo "error: must be yes or no: --with-motif=$with_motif"
  exit 1
fi

if test "$with_motif" = yes; then
  have_motif=no
  AC_CHECK_X_HEADER(Xm/Xm.h,
                    [have_motif=yes
                     AC_DEFINE(HAVE_MOTIF)
                     MOTIF_LIBS="$MOTIF_LIBS -lXm"],,
                    [#include <stdlib.h>
                     #include <stdio.h>
                     #include <X11/Intrinsic.h>])
fi


if test "$have_motif" = yes; then
  AC_CHECK_X_HEADER(Xm/ComboBox.h, [AC_DEFINE(HAVE_XMCOMBOBOX)],,
                    [#include <stdlib.h>
                     #include <stdio.h>
                     #include <X11/Intrinsic.h>])
fi


###############################################################################
#
#       Checking whether Motif is really Lesstif.
#
###############################################################################

have_lesstif=no
if test "$have_motif" = yes ; then
  AC_CACHE_CHECK([whether Motif is really LessTif], 
                 ac_cv_have_lesstif,
                 [AC_TRY_X_COMPILE([#include <Xm/Xm.h>],
                                   [long vers = LesstifVersion;],
                                   [ac_cv_have_lesstif=yes],
                                   [ac_cv_have_lesstif=no])])
  have_lesstif=$ac_cv_have_lesstif
fi


lesstif_version=unknown
lesstif_version_string=unknown

if test "$have_lesstif" = yes ; then
  ltv=unknown
  echo unknown > conftest-lt
  AC_CACHE_CHECK([LessTif version number],
                 ac_cv_lesstif_version_string,
      [AC_TRY_X_RUN([#include <stdio.h>
                     #include <Xm/Xm.h>
                     int main() {
                       FILE *f = fopen("conftest-lt", "w");
                       if (!f) exit(1);
                       fprintf(f, "%d %d.%d\n", LesstifVersion,
                          LESSTIF_VERSION, LESSTIF_REVISION);
                       fclose(f);
                       exit(0);
                     }],
                    [ltv=`cat conftest-lt`
                     ac_cv_lesstif_version=`echo $ltv | sed 's/ .*//'`
                     ac_cv_lesstif_version_string=`echo $ltv | sed 's/.* //'`],
                    [ac_cv_lesstif_version=unknown
                     ac_cv_lesstif_version_string=unknown],
                    [ac_cv_lesstif_version=unknown
                     ac_cv_lesstif_version_string=unknown])])
  rm -f conftest-lt
  lesstif_version=$ac_cv_lesstif_version
  lesstif_version_string=$ac_cv_lesstif_version_string

fi


if test "$have_motif" = yes ; then
  mtv=unknown
  echo unknown > conftest-mt
  AC_CACHE_CHECK([Motif version number],
                 ac_cv_motif_version_string,
      [AC_TRY_X_RUN([#include <stdio.h>
                     #include <Xm/Xm.h>
                     int main() {
                       FILE *f = fopen("conftest-mt", "w");
                       if (!f) exit(1);
                       fprintf(f, "%d %d.%d\n", XmVersion,
                          XmVERSION, XmREVISION);
                       fclose(f);
                       exit(0);
                     }],
                    [mtv=`cat conftest-mt`
                     ac_cv_motif_version=`echo $mtv | sed 's/ .*//'`
                     ac_cv_motif_version_string=`echo $mtv | sed 's/.* //'`],
                    [ac_cv_motif_version=unknown
                     ac_cv_motif_version_string=unknown],
                    [ac_cv_motif_version=unknown
                     ac_cv_motif_version_string=unknown])])
  rm -f conftest-mt
  motif_version=$ac_cv_motif_version
  motif_version_string=$ac_cv_motif_version_string

fi


###############################################################################
#
#       Checking whether Motif requires -lXp.
#
#       Some versions of Motif (2.1.0, at least) require -lXp, the "X Printing
#       Extension".   Why this extension isn't in -lXext with all the others,
#       I have no idea.
#
###############################################################################

have_xp_ext=no
if test "$have_motif" = yes ; then
   have_xp_ext=no
   AC_CHECK_X_LIB(Xp, XpQueryExtension,
                  [have_xp_ext=yes; MOTIF_LIBS="$MOTIF_LIBS -lXp"],
                  [true], -lX11 -lXext -lm)
fi


###############################################################################
#
#       Checking whether Motif requires -lXintl (for _Xsetlocale.)
#
###############################################################################

have_xintl=no
if test "$have_motif" = yes ; then
  AC_CHECK_X_LIB(Xintl, _Xsetlocale, [have_xintl=yes], [have_xintl=no],
                 -lX11 -lXext -lm)
  if test "$have_xintl" = yes; then
    MOTIF_LIBS="$MOTIF_LIBS -lXintl"
  fi
fi


###############################################################################
#
#       Check for a login manager for a "New Login" button on the lock dialog.
#	Usually this will be "/usr/bin/gdmflexiserver".
#
###############################################################################

with_login_manager_req=unspecified
default_login_manager_1='gdmflexiserver -ls'
default_login_manager_2='kdmctl reserve'
default_login_manager_3='lxdm -c USER_SWITCH'
default_login_manager_4='dm-tool switch-to-greeter'

AC_ARG_WITH(login-manager,
[  --with-login-manager    Put a "New Login" button on the unlock dialog that
                          runs a login manager like gdmflexiserver or kdmctl.],
  [with_login_manager="$withval"; with_login_manager_req="$withval"],
  [with_login_manager=yes])
# no HANDLE_X_PATH_ARG for this one

if test "$enable_locking" = no ; then
  with_login_manager_req=no
  with_login_manager=no
fi

case "$with_login_manager_req" in
  no)
    with_login_manager=""
  ;;

  yes|unspecified)
    # Try various defaults, use the first one that exists.

    with_login_manager=""

    if test -z "$with_login_manager" ; then
      set dummy $default_login_manager_1 ; login_manager_tmp=$2
      unset ac_cv_path_login_manager_tmp  # don't cache
      AC_PATH_PROG(login_manager_tmp, $login_manager_tmp, [])
      if test ! -z "$login_manager_tmp" ; then
        with_login_manager="$default_login_manager_1"
      fi
    fi

    if test -z "$with_login_manager" ; then
      set dummy $default_login_manager_2 ; login_manager_tmp=$2
      unset ac_cv_path_login_manager_tmp  # don't cache
      AC_PATH_PROG(login_manager_tmp, $login_manager_tmp, [])
      if test ! -z "$login_manager_tmp" ; then
        with_login_manager="$default_login_manager_2"
      fi
    fi

    if test -z "$with_login_manager" ; then
      set dummy $default_login_manager_3 ; login_manager_tmp=$2
      unset ac_cv_path_login_manager_tmp  # don't cache
      AC_PATH_PROG(login_manager_tmp, $login_manager_tmp, [])
      if test ! -z "$login_manager_tmp" ; then
        with_login_manager="$default_login_manager_3"
      fi
    fi

    if test -z "$with_login_manager" ; then
      set dummy $default_login_manager_4 ; login_manager_tmp=$2
      unset ac_cv_path_login_manager_tmp  # don't cache
      AC_PATH_PROG(login_manager_tmp, $login_manager_tmp, [])
      if test ! -z "$login_manager_tmp" ; then
        with_login_manager="$default_login_manager_4"
      fi
    fi

  ;;

  /*)
    # absolute path specified on cmd line
    set dummy $with_login_manager_req ; login_manager_tmp=$2
    AC_MSG_CHECKING([for $login_manager_tmp])
    if test -x "$login_manager_tmp" ; then
      AC_MSG_RESULT(yes)
    else
      AC_MSG_RESULT(no)
      with_login_manager=""
    fi
  ;;

  *)
    # relative path specified on cmd line
    set dummy $with_login_manager_req ; login_manager_tmp=$2
    unset ac_cv_path_login_manager_tmp    # don't cache
    AC_PATH_PROG(login_manager_tmp, $login_manager_tmp, [])
    if test -z "$login_manager_tmp" ; then
      with_login_manager=""
    else
      with_login_manager="$login_manager_tmp"
    fi
  ;;
esac
ac_cv_login_manager_program="$with_login_manager"

NEW_LOGIN_COMMAND_P=''
NEW_LOGIN_COMMAND="$ac_cv_login_manager_program"

AC_MSG_CHECKING(for login manager)
if test -z "$NEW_LOGIN_COMMAND" ; then
  NEW_LOGIN_COMMAND="$default_login_manager_1"
  NEW_LOGIN_COMMAND_P='! '
  AC_MSG_RESULT($NEW_LOGIN_COMMAND (disabled))
else
  AC_MSG_RESULT($NEW_LOGIN_COMMAND)
fi



###############################################################################
#
#       Check for a directory full of images to use as the default value
#	of the "imageDirectory" preference.
#
###############################################################################

have_imagedir=no
with_imagedir_req=unspecified

AC_ARG_WITH(image-directory,
[  --with-image-directory  Some demos will display random images from here.],
  [with_imagedir="$withval"; with_imagedir_req="$withval"],
  [with_imagedir=yes])
# no HANDLE_X_PATH_ARG for this one

case "$with_imagedir" in
  /*)
    # absolute path
    AC_MSG_CHECKING([for image directory $with_imagedir])
    if test -d "$with_imagedir" ; then
      AC_MSG_RESULT(yes)
    else
      AC_MSG_RESULT(no)
      with_imagedir=""
    fi
  ;;
  yes)
    with_imagedir=""

    #### Could use some more defaults here...
    for dd in \
      "/usr/share/rpd-wallpaper"                \
      "/usr/share/backgrounds/images/"          \
      "/usr/share/wallpapers/"                  \
      "/Library/Desktop Pictures/"              \
    ; do
      if test -z "$with_imagedir"; then
        AC_MSG_CHECKING([for image directory $dd])
        if test -d "$dd" ; then
          AC_MSG_RESULT(yes)
          with_imagedir="$dd"
        else
          AC_MSG_RESULT(no)
        fi
      fi
    done

  ;;
  no)
    with_imagedir=""
  ;;

  *)
    echo "error: must be an absolute path: --with-image-directory=$with_imagedir_req"
    exit 1
  ;;
esac
ac_cv_imagedir="$with_imagedir"

DEFAULT_IMAGES_P='True'
DEFAULT_IMAGE_DIRECTORY="$ac_cv_imagedir"

if test -z "$DEFAULT_IMAGE_DIRECTORY" ; then
  DEFAULT_IMAGES_P='False'
fi


###############################################################################
#
#       Pick a text file to use as the default of the "textFile" preference.
#	Any old file will do, but preferably one that will make interesting
#	shapes when displayed by "starwars" and "fontglide".
#
###############################################################################

have_textfile=no
with_textfile_req=unspecified

AC_ARG_WITH(text-file,
[  --with-text-file=FILE   Some demos will use this as a source of text.],
  [with_textfile="$withval"; with_textfile_req="$withval"],
  [with_textfile=yes])
# no HANDLE_X_PATH_ARG for this one

case "$with_textfile" in
  /*)
    # absolute path
    AC_MSG_CHECKING([for text file $with_textfile])
    if test -f "$with_textfile" ; then
      AC_MSG_RESULT(yes)
    else
      AC_MSG_RESULT(no)
      with_textfile=""
    fi
  ;;
  yes)
    with_textfile=""

    #### Could use some more defaults here...
    for f in \
      "/usr/X11R6/lib/X11/doc/README"		   \
      "/usr/share/doc/xserver-common/copyright"	   \
      "/usr/share/doc/xserver-xorg-core/copyright" \
      "/usr/X11R6/README"			   \
      "/usr/share/doc/libX11*/COPYING"		   \
      "/usr/X11/share/X11/doc/README*"		   \
      "/usr/share/doc/debian/debian-manifesto"     \
    ; do
      if test -z "$with_textfile"; then
        AC_MSG_CHECKING([for text file $f])
	f=`/bin/ls $f 2>&- | head -1`
        if test -f "$f" ; then
          AC_MSG_RESULT(yes)
          with_textfile="$f"
        else
          AC_MSG_RESULT(no)
        fi
      fi
    done

  ;;
  no)
    with_textfile=""
  ;;

  *)
    echo "error: must be an absolute path: --with-text-file=$with_textfile_req"
    exit 1
  ;;
esac
ac_cv_textfile="$with_textfile"

DEFAULT_TEXT_FILE="$ac_cv_textfile"


###############################################################################
#
#       Check the browser to see help URL
#
###############################################################################

have_browser=no
with_browser_req=unspecified

AC_ARG_WITH(browser,
[  --with-browser=BROWSER  The web browser used to open the "Help" URL.],
  [with_browser="$withval"; with_browser_req="$withval"],
  [with_browser=no ])
# no HANDLE_X_PATH_ARG for this one

case "$with_browser" in
  no )
  ;;
  * )
    WITH_BROWSER=$with_browser
    gnome_open_program=$with_browser
    AC_MSG_CHECKING([for browser $with_browser])
    with_browser_fullpath=`which $with_browser 2>/dev/null`
    case $with_browser_fullpath in
	 /* )
	        AC_MSG_RESULT(yes)
		 have_browser=yes
		 ;;
	* )
	       AC_MSG_RESULT(no)
# Only warning: we don't want to install all packages for the 
# dependency of the browser in building stage...
	       echo "WARNING: browser not found: --with-browser=$with_browser"
	       ;;
    esac
  ;;
esac
ac_cv_browser="$with_browser"


###############################################################################
#
#       Check for -lGL or -lMesaGL.
#
###############################################################################

#### H1

have_gl=no
ac_have_mesa_gl=no
with_gl_req=unspecified
gl_halfassed=no
have_glext=no
AC_ARG_WITH(gl,
[
Graphics Options:

  --with-gl               Build those demos which depend on OpenGL.],
  [with_gl="$withval"; with_gl_req="$withval"],[with_gl=yes])

HANDLE_X_PATH_ARG(with_gl, --with-gl, GL)

ac_mesagl_version=unknown
ac_mesagl_version_string=unknown

if test "$with_gl" = yes; then
  AC_CHECK_X_HEADER(GL/gl.h, have_gl=yes, have_gl=no)
  if test "$have_gl" = yes ; then
    AC_CHECK_X_HEADER(GL/glx.h, have_gl=yes, have_gl=no,
                      [#include <GL/gl.h>])
  fi

  # If we have the headers, try and figure out which vendor it's from.
  #
  if test "$have_gl" = yes ; then

    # We need to know whether it's MesaGL so that we know which libraries
    # to link against.
    #
    AC_CACHE_CHECK([whether GL is really MesaGL], ac_cv_have_mesa_gl,
      [ac_cv_have_mesa_gl=no
       if test "$ac_macosx" = no; then
         # WTF! MacOS 10.5.0 ships the Mesa GL headers!
         # It's not really Mesa, is it?
         AC_EGREP_X_HEADER(Mesa|MESA, GL/glx.h, [ac_cv_have_mesa_gl=yes])
       fi])
    ac_have_mesa_gl=$ac_cv_have_mesa_gl

    gl_lib_1=""
    GL_LIBS=""

    if test "$ac_macosx" = yes; then

      # Without these, every link against libGL gets a bunch of useless
      # warnings.
      #
      osx_crud="-bind_at_load -multiply_defined suppress"
      AC_MSG_RESULT(adding "$osx_crud" to GL_LIBS)
      GL_LIBS="$GL_LIBS $osx_crud"
      unset osx_crud

      # New lossage in 10.5.0: without this, we get:
      #   ld: cycle in dylib re-exports with /usr/X11/lib/libGL.dylib
      #
      osx_crud="/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib"
      osx_crud="-Wl,-dylib_file,${osx_crud}:${osx_crud}"

      AC_MSG_RESULT(adding "$osx_crud" to GL_LIBS)
      GL_LIBS="$GL_LIBS $osx_crud"
      unset osx_crud

      # New lossage in 10.6.8: we can't allow -L/opt/local/lib to be in the
      # link line, or at runtime XQueryExtension gets a segv due to some kind
      # of library version skew.  Libs must come from /usr/X11/lib even if
      # $prefix and/or $exec_prefix are set to /opt/local/.
      #
      AC_MSG_RESULT(omitting "$libdir" from LDFLAGS)
      libdir=''

      # Looks like as of OSX 10.12, gcc can't do ObjC.
      OBJCC="clang -Wall"

    fi


    # Some versions of MesaGL are compiled to require -lpthread.
    # So if the Mesa headers exist, and -lpthread exists, then always
    # link -lpthread after the Mesa libs (be they named -lGL or -lMesaGL.)
    #
    # Oftentimes, AX_PTHREAD will bring in -lpthread as well; but that ends
    # up before -l(Mesa)GL, instead of after where it would belong.
    #
    if test "$ac_have_mesa_gl" = yes; then
      AC_CHECK_LIB(pthread, pthread_create, [GL_LIBS="-lpthread"], [],)
    fi


    # If we have Mesa headers, check to see if we can link against -lMesaGL.
    # If we don't have Mesa headers, or we don't have -lMesaGL, try -lGL.
    # Else, warn that GL is busted.  (We have the headers, but no libs.)
    #

    if test "$ac_have_mesa_gl" = yes ; then
      AC_CHECK_X_LIB(MesaGL, glXCreateContext, 
                     [gl_lib_1="MesaGL"
                      GL_LIBS="-lMesaGL -lMesaGLU $VIDMODE_LIBS $GL_LIBS"],
                     [], -lMesaGLU $GL_LIBS -lX11 -lXext $VIDMODE_LIBS -lm)
    fi

    if test "$gl_lib_1" = "" ; then
      AC_CHECK_X_LIB(GL, glXCreateContext, 
                     [gl_lib_1="GL"
                      GL_LIBS="-lGL -lGLU $VIDMODE_LIBS $GL_LIBS"],
                     [], -lGLU $GL_LIBS -lX11 -lXext $VIDMODE_LIBS -lm)
    fi

    if test "$gl_lib_1" = "" ; then
      # we have headers, but no libs -- bail.
      have_gl=no
      ac_have_mesa_gl=no
      gl_halfassed=yes
    else
      # linking works -- we can build the GL hacks.
      AC_DEFINE(HAVE_GL)
      if test "$ac_have_mesa_gl" = yes ; then
        AC_DEFINE(HAVE_MESA_GL)
      fi
    fi
  fi


  # Now that we know we have GL headers and libs, do some more GL testing.
  #

  if test "$have_gl" = yes ; then
    # If it's MesaGL, we'd like to issue a warning if the version number
    # is less than or equal to 2.6, because that version had a security bug.
    #
    if test "$ac_have_mesa_gl" = yes; then

      AC_CACHE_CHECK([MesaGL version number], ac_cv_mesagl_version_string,
        [cat > conftest.$ac_ext <<EOF
#line __oline__ "configure"
#include "confdefs.h"
#include <GL/gl.h>
#ifndef MESA_MAJOR_VERSION
# include <GL/xmesa.h>
# ifdef XMESA_MAJOR_VERSION
   /* Around Mesa 3.2, they took out the Mesa version number, so instead,
      we have to check the XMesa version number (the number of the X protocol
      support, which seems to be the same as the Mesa version number.)
    */
#  define MESA_MAJOR_VERSION XMESA_MAJOR_VERSION
#  define MESA_MINOR_VERSION XMESA_MINOR_VERSION
# else
   /* Oh great.  Some time after 3.4, they took out the xmesa.h header file,
      so we have no way of telling what version of Mesa this is at all.
      So, we'll guess that the osmesa version (the "offscreen protocol")
      is less than or equal to the real mesa version number.  Except that
      if OSmesa is 3.3, assume at least Mesa 3.4, since OSmesa was 3.3 in
      Mesa 3.4.  And Mesa 3.3 had xmesa.h.  What a complete load of shit!
    */
# include <GL/osmesa.h>
#  define MESA_MAJOR_VERSION OSMESA_MAJOR_VERSION
#  define MESA_MINOR_VERSION OSMESA_MINOR_VERSION or newer, probably?
#  if OSMESA_MAJOR_VERSION == 3 && OSMESA_MINOR_VERSION == 3
#   undef MESA_MINOR_VERSION
#   define MESA_MINOR_VERSION 4 or newer, probably?
#  endif
# endif
#endif
configure: MESA_MAJOR_VERSION MESA_MINOR_VERSION
EOF

         ac_save_CPPFLAGS="$CPPFLAGS"
         if test \! -z "$includedir" ; then 
           CPPFLAGS="$CPPFLAGS -I$includedir"
         fi
         CPPFLAGS="$CPPFLAGS $X_CFLAGS"

         mglv=`(eval "$ac_cpp conftest.$ac_ext") 2>&AC_FD_CC | grep configure:`

         # M4 sucks!!
         changequote(X,Y)
          mglv=`echo "$mglv" | sed -n \
             's/^configure: *\([0-9][0-9]*\)  *\([0-9].*\)$/\1.\2/p'`
         changequote([,])

         rm -f conftest.$ac_ext

         CPPFLAGS="$ac_save_CPPFLAGS"

         if test "$mglv" = ""; then
           ac_mesagl_version=unknown
           ac_mesagl_version_string=unknown
         else
           ac_mesagl_version_string="$mglv"
           # M4 sucks!!
           changequote(X,Y)
           maj=`echo "$mglv" | sed -n 's/^\([0-9][0-9]*\)\..*$/\1/p'`
           min=`echo "$mglv" | sed -n 's/^.*\.\([0-9][0-9]*\).*$/\1/p'`
           changequote([,])
           ac_mesagl_version=`echo "$maj * 1000 + $min" | bc`
           if test -z "$ac_mesagl_version"; then
             ac_mesagl_version=unknown
             ac_mesagl_version_string=unknown
           fi
         fi
         ac_cv_mesagl_version=$ac_mesagl_version
         ac_cv_mesagl_version_string=$ac_mesagl_version_string
      ])
      ac_mesagl_version=$ac_cv_mesagl_version
      ac_mesagl_version_string=$ac_cv_mesagl_version_string
    fi


    # Check for OpenGL 1.1 features.
    #
    AC_CHECK_X_LIB($gl_lib_1, glBindTexture, [AC_DEFINE(HAVE_GLBINDTEXTURE)],
                   [true], $GL_LIBS -lX11 -lXext -lm)

    # Check for OpenGL GLSL features.
    #
    AC_CHECK_X_HEADER(GL/glext.h, have_glext=yes, have_glext=no,
                      [#include <GL/gl.h>])
    if test "$have_glext" = yes ; then
      AC_CHECK_X_LIB($gl_lib_1, glUseProgram, [AC_DEFINE(HAVE_GLSL)],
                     [true], $GL_LIBS -lX11 -lXext -lm)
    fi
  fi

elif test "$with_gl" != no; then
  echo "error: must be yes or no: --with-gl=$with_gl"
  exit 1
fi


###############################################################################
#
#       Check for -lgle.
#
###############################################################################

have_gle=no
with_gle_req=unspecified
gle_halfassed=no
AC_ARG_WITH(gle,
[  --with-gle              Build those demos which depend on GLE (extrusion).],
  [with_gle="$withval"; with_gle_req="$withval"],[with_gle=yes])

HANDLE_X_PATH_ARG(with_gle, --with-gle, GLE)

GLE_LIBS=""

if test "$have_gl" = no ; then
 true
elif test "$with_gle" = yes; then

  AC_CHECK_X_HEADER(GL/gle.h, have_gle3=yes, have_gle3=no,
                    [#include <GL/gl.h>])
  if test "$have_gle3" = yes ; then
    have_gle=yes;
  else
    AC_CHECK_X_HEADER(GL/gutil.h, have_gle=yes, have_gle=no,
                    [#include <GL/gl.h>])
    if test "$have_gle" = yes ; then
      AC_CHECK_X_HEADER(GL/tube.h, have_gle=yes, have_gle=no,
                        [#include <GL/gl.h>])
    fi
  fi

  if test "$have_gle" = yes ; then
    have_gle=no
    gle_halfassed=yes
    AC_CHECK_X_LIB(gle, gleCreateGC, 
                   [have_gle=yes; gle_halfassed=no; GLE_LIBS="-lgle"],
                   [], $GL_LIBS -lX11 -lXext -lm)
  fi
  if test "$have_gle" = yes ; then
    have_gle=no
    gle_halfassed=yes

    # sometimes the libmatrix stuff is included in libgle.  look there first.
#
# I don't get it.  For some reason, this test passes on SGI, as if
# uview_direction_d() was in libgle -- but it's not, it's in libmatrix.
# Yet the link is succeeding.  Why???
#
#    AC_CHECK_X_LIB(gle, uview_direction_d, 
#                   [have_gle=yes; gle_halfassed=no],
#                   [], $GL_LIBS -lX11 -lXext -lm)

    # As of GLE 3 this is in libgle, and has changed name to uview_direction!
    # *sigh*
    if test "$have_gle3" = yes ; then
      AC_CHECK_X_LIB(gle, uview_direction, 
                     [have_gle=yes; gle_halfassed=no],
                    [], $GL_LIBS -lX11 -lXext -lm)
    fi
    # if it wasn't in libgle, then look in libmatrix.
    if test "$have_gle" = no ; then
      AC_CHECK_X_LIB(matrix, uview_direction_d, 
                     [have_gle=yes; gle_halfassed=no;
                      GLE_LIBS="$GLE_LIBS -lmatrix"],
                    [], $GL_LIBS -lX11 -lXext -lm)
    fi
  fi

  if test "$have_gle" = yes ; then
    AC_DEFINE(HAVE_GLE)
    if test "$have_gle3" = yes ; then
      AC_DEFINE(HAVE_GLE3)
    fi
  fi

elif test "$with_gle" != no; then
  echo "error: must be yes or no: --with-gle=$with_gle"
  exit 1

fi


###############################################################################
#
#       Handle --with-gles
#
###############################################################################

with_gles_req=unspecified
AC_ARG_WITH(gles,
[  --with-gles             Target OpenGL ES 1.x API instead of OpenGL 1.3.],
  [with_gles="$withval"; with_gles_req="$withval"],[with_gles=no])

HANDLE_X_PATH_ARG(with_gles, --with-gles, JWZGLES)

if test "$with_gles" = yes; then
  have_gles=yes
  AC_DEFINE(HAVE_JWZGLES)
  JWZGLES_OBJS='$(JWXYZ_BIN)/jwzgles.o'
  AC_MSG_RESULT(using OpenGL ES compatiblity shim)
elif test "$with_gles" != no; then
  echo "error: must be yes or no: --with-gles=$with_gles"
  exit 1
fi

###############################################################################
#
#       Check for -ljpeg
#
###############################################################################

have_jpeg=no
with_jpeg_req=unspecified
jpeg_halfassed=no
AC_ARG_WITH(jpeg,
[  --with-jpeg             Include support for the JPEG library.],
  [with_jpeg="$withval"; with_jpeg_req="$withval"],
  [with_jpeg=yes])

HANDLE_X_PATH_ARG(with_jpeg, --with-jpeg, JPEG)

if test "$with_jpeg" != yes -a "$with_jpeg" != no ; then
  echo "error: must be yes or no: --with-jpeg=$with_jpeg"
  exit 1
fi

if test "$with_jpeg" = yes; then

  have_jpeg=no
  AC_CHECK_X_HEADER(jpeglib.h, [have_jpeg=yes])

  if test "$have_jpeg" = yes; then
    # we have the header, now check for the library
    have_jpeg=no
    jpeg_halfassed=yes
    AC_CHECK_X_LIB(jpeg, jpeg_start_compress,
                   [have_jpeg=yes
                    jpeg_halfassed=no
                    JPEG_LIBS="-ljpeg"
                    AC_DEFINE(HAVE_JPEGLIB)])
  fi
fi


###############################################################################
#
#       Check for -lpng
#
###############################################################################

have_png=no
with_png_req=unspecified
png_halfassed=no
AC_ARG_WITH(png,
[  --with-png              Include support for the PNG library.],
  [with_png="$withval"; with_png_req="$withval"],
  [with_png=yes])

HANDLE_X_PATH_ARG(with_png, --with-png, PNG)

if test "$with_png" != yes -a "$with_png" != no ; then
  echo "error: must be yes or no: --with-png=$with_png"
  exit 1
fi

if test "$with_png" = yes; then

  have_png=no
  AC_CHECK_X_HEADER(png.h, [have_png=yes])

  if test "$have_png" = yes; then
    # we have the header, now check for the library
    have_png=no
    png_halfassed=yes
    AC_CHECK_X_LIB(png, png_create_read_struct,
                   [have_png=yes
                    png_halfassed=no
                    PNG_LIBS="-lpng"
                    AC_DEFINE(HAVE_LIBPNG)])
  fi
fi


###############################################################################
#
#       Check for -lgdk_pixbuf.
#       These tests are for gdk_pixbuf usage of the hacks, 
#       not xscreensaver-demo (thus we have to test again to get
#       the libraries right: don't want to pull in all of GTK
#       for the hacks.)
#
###############################################################################

have_gdk_pixbuf=no
with_gdk_pixbuf_req=unspecified
AC_ARG_WITH(pixbuf,
[  --with-pixbuf           Include support for the GDK-Pixbuf library, which
                          allows the display of JPEG, PNG, GIF and SVG images.],
  [with_gdk_pixbuf="$withval"; with_gdk_pixbuf_req="$withval"],
  [with_gdk_pixbuf=yes])

# if --with-pixbuf=/directory/ was specified, remember that directory so that
# we can also look for the `gdk-pixbuf-config' program in that directory.
case "$with_gdk_pixbuf" in
  /*)
    gdk_pixbuf_dir="$with_gdk_pixbuf"
    ;;
  *)
    gdk_pixbuf_dir=""
    ;;
esac

HANDLE_X_PATH_ARG(with_gdk_pixbuf, --with-pixbuf, GDK_PIXBUF)

if test "$with_gdk_pixbuf" != yes -a "$with_gdk_pixbuf" != no ; then
  echo "error: must be yes or no: --with-pixbuf=$with_gdk_pixbuf"
  exit 1
fi

if test "$with_gdk_pixbuf" = yes; then
  have_gdk_pixbuf=no

  pkgs=''
  ok="yes"

  pkg_check_version gdk-pixbuf-2.0      2.0.0
  pkg_check_version gdk-pixbuf-xlib-2.0 2.0.0
  pkg_check_version gio-2.0             2.0.0
  have_gdk_pixbuf="$ok"

  if test "$have_gdk_pixbuf" = yes; then
    AC_CACHE_CHECK([for gdk-pixbuf includes], ac_cv_gdk_pixbuf_config_cflags,
               [ac_cv_gdk_pixbuf_config_cflags=`$pkg_config --cflags $pkgs`])
    AC_CACHE_CHECK([for gdk-pixbuf libs], ac_cv_gdk_pixbuf_config_libs,
               [ac_cv_gdk_pixbuf_config_libs=`$pkg_config --libs $pkgs`])
  fi

  ac_gdk_pixbuf_config_cflags=$ac_cv_gdk_pixbuf_config_cflags
  ac_gdk_pixbuf_config_libs=$ac_cv_gdk_pixbuf_config_libs


  if test "$have_gdk_pixbuf" = yes; then
    #
    # we appear to have pixbuf; check for headers/libs to be sure.
    #
    ac_save_gdk_pixbuf_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$CPPFLAGS $ac_gdk_pixbuf_config_cflags"

    have_gdk_pixbuf=no

    # check for header A...
    AC_CHECK_X_HEADER(gdk-pixbuf/gdk-pixbuf.h, [have_gdk_pixbuf=yes])

    # if that worked, check for header B...
    if test "$have_gdk_pixbuf" = yes; then
      have_gdk_pixbuf=no
      gdk_pixbuf_halfassed=yes
      AC_CHECK_X_HEADER(gdk-pixbuf/gdk-pixbuf-xlib.h,
                        [have_gdk_pixbuf=yes
                         gdk_pixbuf_halfassed=no])

      # yay, it has a new name in Gtk 2.x...
      if test "$have_gdk_pixbuf" = no; then
        have_gdk_pixbuf=no
        gdk_pixbuf_halfassed=yes
        AC_CHECK_X_HEADER(gdk-pixbuf-xlib/gdk-pixbuf-xlib.h,
                          [have_gdk_pixbuf=yes
                           gdk_pixbuf_halfassed=no])
      fi
    fi
    CPPFLAGS="$ac_save_gdk_pixbuf_CPPFLAGS"
  fi

  if test "$have_gdk_pixbuf" = yes; then
    # we have the headers, now check for the libraries
    have_gdk_pixbuf=no
    gdk_pixbuf_halfassed=yes

    AC_MSG_RESULT(checking for gdk_pixbuf usability...)

    # library A...
    AC_CHECK_X_LIB(c, gdk_pixbuf_new_from_file, [have_gdk_pixbuf=yes],,
                   $ac_gdk_pixbuf_config_libs -lX11 -lXext -lm)
    # library B...
    if test "$have_gdk_pixbuf" = yes; then
      have_gdk_pixbuf=no
      AC_CHECK_X_LIB(c, gdk_pixbuf_xlib_init,
                     [have_gdk_pixbuf=yes
                      gdk_pixbuf_halfassed=no],,
                     $ac_gdk_pixbuf_config_libs -lX11 -lXext -lm)
    fi
  fi

  if test "$have_gdk_pixbuf" = yes; then
    INCLUDES="$INCLUDES $ac_gdk_pixbuf_config_cflags"
    PNG_LIBS="$ac_gdk_pixbuf_config_libs"
    AC_DEFINE(HAVE_GDK_PIXBUF)
  else
    AC_MSG_RESULT(checking for gdk_pixbuf usability... no)
  fi

  if test "$have_gdk_pixbuf" = yes; then
    AC_CHECK_X_LIB(c, gdk_pixbuf_apply_embedded_orientation,
                     [AC_DEFINE(HAVE_GDK_PIXBUF_APPLY_EMBEDDED_ORIENTATION)],,
                     $ac_gdk_pixbuf_config_libs -lX11 -lXext -lm)
  fi
fi


###############################################################################
#
#       Check for -lXft
#
###############################################################################

have_xutf8drawstring=no
AC_CHECK_X_LIB(X11, Xutf8DrawString,
               [have_xutf8drawstring=yes],
               [true], -lX11 -lXext -lm)
if test "$have_xutf8drawstring" = yes ; then
  AC_DEFINE(HAVE_XUTF8DRAWSTRING)
fi


have_xft=no
with_xft_req=unspecified
xft_halfassed=no
AC_ARG_WITH(xft,
[  --with-xft              Include support for the X Freetype library.],
  [with_xft="$withval"; with_xft_req="$withval"],
  [with_xft=yes])

HANDLE_X_PATH_ARG(with_xft, --with-xft, Xft)

if test "$with_xft" != yes -a "$with_xft" != no ; then
  echo "error: must be yes or no: --with-xft=$with_xft"
  exit 1
fi

if test "$with_xft" = yes; then

  pkgs=''
  ok="yes"
  pkg_check_version xft 2.1.0
  have_xft="$ok"

  if test "$have_xft" = yes; then
    AC_CACHE_CHECK([for Xft includes], ac_cv_xft_config_cflags,
               [ac_cv_xft_config_cflags=`$pkg_config --cflags $pkgs`])
    AC_CACHE_CHECK([for Xft libs], ac_cv_xft_config_libs,
               [ac_cv_xft_config_libs=`$pkg_config --libs $pkgs`])
  fi

  ac_xft_config_cflags=$ac_cv_xft_config_cflags
  ac_xft_config_libs=$ac_cv_xft_config_libs

  if test "$have_xft" = yes; then
    #
    # we appear to have Xft; check for headers/libs to be sure.
    #
    ac_save_xft_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$CPPFLAGS $ac_xft_config_cflags"

    have_xft=no
    AC_CHECK_X_HEADER(X11/Xft/Xft.h, [have_xft=yes])

    CPPFLAGS="$ac_save_xft_CPPFLAGS"
  fi

  if test "$have_xft" = yes; then
    # we have the headers, now check for the libraries
    have_xft=no
    xft_halfassed=yes

    AC_MSG_RESULT(checking for Xft usability...)
    AC_CHECK_X_LIB(c, XftDrawStringUtf8, [have_xft=yes],,
                   $ac_xft_config_libs -lX11 -lXext -lm)
  fi

  if test "$have_xft" = no; then
    AC_MSG_RESULT(checking for Xft usability... no)
  fi
fi

if test "$have_xft" = yes; then
  INCLUDES="$INCLUDES $ac_xft_config_cflags"
  XFT_LIBS="$ac_xft_config_libs"
  XFT_SRCS=''
  XFT_OBJS=''
  AC_DEFINE(HAVE_XFT)
else
  XFT_LIBS=''
  XFT_SRCS='$(UTILS_SRC)/xft.c'
  XFT_OBJS='$(UTILS_BIN)/xft.o'
fi


# Also check for the standard X11 bitmap fonts, since Debian likes to not
# install any of those by default.  The unlock dialog requires them.
#
have_bitmap_fonts=no
ff='helvB14.pcf.gz helvB14-ISO8859-1.pcf.gz'
AC_MSG_CHECKING(for bitmap font files)
for d in /usr/share/fonts/X11 \
         /usr/share/X11/fonts \
         /opt/X11/share/fonts \
; do
  for r in 100dpi 75dpi ; do
    for f in $ff ; do
      if test -f "$d/$r/$f" ; then
        have_bitmap_fonts=yes
      fi
    done
  done
done
AC_MSG_RESULT($have_bitmap_fonts)

# In case we didn't guess the font directory properly, check RPMs and DEBs too.
if test $have_bitmap_fonts != yes ; then
  for r in 100dpi 75dpi ; do
    for f in xfonts-$r \
             xorg-x11-fonts-$r \
             xorg-x11-fonts-ISO8859-1-$r \
      ; do
      if test $have_bitmap_fonts != yes ; then
        AC_MSG_CHECKING(for $f)
        if ( rpm -q "$f"  2>&- >&- ) ||
           ( dpkg -s "$f" 2>&- | grep -q '^Status:.*installed' ) ; then
          have_bitmap_fonts=yes
        fi
        AC_MSG_RESULT($have_bitmap_fonts)
      fi
    done
  done
fi


###############################################################################
#
#       Check for pty support: this allows 'phosphor' and 'apple2'
#	to run curses-based programs, or be used as terminal windows.
#
###############################################################################

PTY_LIBS=
AC_CHECK_HEADERS(pty.h util.h sys/termios.h)
AC_CHECK_X_LIB(util, forkpty,
               [PTY_LIBS="-lutil"
                ac_have_forkpty=yes
                AC_DEFINE(HAVE_FORKPTY)])

if test "$ac_have_forkpty" != yes ; then
  # we don't need (or have) -lutil on MacOS 10.4.2...
  AC_CHECK_X_LIB(c, forkpty,
                 [PTY_LIBS=""
                  AC_DEFINE(HAVE_FORKPTY)])
fi


###############################################################################
#
#       Query AX_PTHREAD, and figure out which compiler gets used.
#
###############################################################################

have_pthread=no
with_pthread_req=unspecified

# AX_PTHREAD is from the GNU Autoconf Archive.
# https://savannah.gnu.org/projects/autoconf-archive/
m4_include(ax_pthread.m4)

# This affects CC, LIBS, and CFLAGS, instead of defining new variables.

AC_ARG_WITH([pthread],
[  --with-pthread          Enables POSIX threads, for SMP support.],
  [with_pthread="$withval"; with_pthread_req="$withval"],
  [with_pthread=yes])

if test "$with_pthread" = yes; then
  # AX_PTHREAD might want a different compiler.
  AX_PTHREAD(
   [if test "$CC" = "$PTHREAD_CC" -o -z "$ac_original_cc"; then
      have_pthread=yes
    else
      ac_prog_cc_no_pthread=yes
    fi
  ])

  if test "$have_pthread" = yes; then
    AC_DEFINE([HAVE_PTHREAD])
    CC=$PTHREAD_CC
  fi
fi


###############################################################################
#
#       Check for libcap, which allows "sonar" to work without setuid.
#
###############################################################################

have_libcap=no
setcap_hacks_default=yes
setcap_hacks="$setcap_hacks_default"
setcap_hacks_req=unspecified
AC_ARG_WITH(setcap-hacks,
[  --with-setcap-hacks     Build the "sonar" demo with libcap, which allows
                          it to ping other hosts without being setuid.],
  [setcap_hacks="$withval"; setcap_hacks_req="$withval"],
  [setcap_hacks=yes])

HANDLE_X_PATH_ARG(setcap_hacks, --with-setcap-hacks, setcap hacks)

if test "$setcap_hacks" != yes -a "$setcap_hacks" != no ; then
  echo "error: must be yes or no: --with-setcap-hacks=$setcap_hacks"
  exit 1
fi

if test "$setcap_hacks" = yes; then

  AC_CHECK_PROGS(setcap_program, setcap)
  if test "$setcap_program" != ''; then
    AC_CHECK_X_HEADER(sys/capability.h, [have_setcap=yes])
  fi
  if test "$have_setcap" = yes; then
    AC_CHECK_X_LIB(cap, cap_set_flag,
                   [have_libcap=yes
                    PROG_SETCAP="$setcap_program"
                    LIBCAP_LIBS="-lcap"
                    AC_DEFINE(HAVE_LIBCAP)])
  fi
fi


###############################################################################
#
#       Option to prevent "sonar" from working properly.
#	It must be setuid on systems without libcap.
#
###############################################################################

if test "$have_libcap" = yes; then
  setuid_hacks_default=no
else
  setuid_hacks_default=yes
fi

setuid_hacks="$setuid_hacks_default"
AC_ARG_WITH(setuid-hacks,
[  --with-setuid-hacks     Install the "sonar" demo as setuid root, which is
                          needed in order to ping other hosts without setcap.],
  [setuid_hacks="$withval"], [setuid_hacks="$setuid_hacks_default"])

HANDLE_X_PATH_ARG(setuid_hacks, --with-setuid-hacks, setuid hacks)

if test "$setuid_hacks" = yes; then
  true
elif test "$setuid_hacks" != no; then
  echo "error: must be yes or no: --with-setuid-hacks=$setuid_hacks"
  exit 1
fi


###############################################################################
#
#       Check for --with-record-animation
#
###############################################################################

record_anim_default=no
record_anim="$record_anim_default"
AC_ARG_WITH(record-animation,
[  --with-record-animation Include code for generating MP4 videos.],
  [record_anim="$withval"], [record_anim="$record_anim_default"])

HANDLE_X_PATH_ARG(record_anim, --with-record-animation, record animation)

if test "$record_anim" = yes; then
  true
elif test "$record_anim" != no; then
  echo "error: must be yes or no: --with-record-animation=$record_anim"
  exit 1
fi

if test "$record_anim" = yes; then
  if test "$have_gdk_pixbuf" != yes; then
    AC_MSG_ERROR(--with-record-animation requires GDK-Pixbuf)
  else
    AC_MSG_RESULT(enabling --with-record-animation)
    AC_DEFINE(HAVE_RECORD_ANIM)
    ANIM_OBJS='$(ANIM_OBJS)'
    ANIM_LIBS='$(ANIM_LIBS)'
  fi
fi


###############################################################################
#
#       Done testing.  Now, set up the various -I and -L variables,
#       and decide which GUI program to build by default.
#
###############################################################################

DEPEND=makedepend
DEPEND_FLAGS=
DEPEND_DEFINES=


if test \! -z "$includedir" ; then 
  INCLUDES="$INCLUDES -I$includedir"
fi

if test \! -z "$libdir" ; then
  LDFLAGS="$LDFLAGS -L$libdir"
fi


PREFERRED_DEMO_PROGRAM=''
ALL_DEMO_PROGRAMS=
if test "$have_motif" = yes; then
  PREFERRED_DEMO_PROGRAM=xscreensaver-demo-Xm
  ALL_DEMO_PROGRAMS="$PREFERRED_DEMO_PROGRAM $ALL_DEMO_PROGRAMS"
fi
if test "$have_gtk" = yes; then
  PREFERRED_DEMO_PROGRAM=xscreensaver-demo-Gtk
  ALL_DEMO_PROGRAMS="$PREFERRED_DEMO_PROGRAM $ALL_DEMO_PROGRAMS"
fi


if test "$have_kerberos" = yes; then
  PASSWD_SRCS="$PASSWD_SRCS \$(KERBEROS_SRCS)"
  PASSWD_OBJS="$PASSWD_OBJS \$(KERBEROS_OBJS)"
fi
if test "$have_pam" = yes; then
  PASSWD_SRCS="$PASSWD_SRCS \$(PAM_SRCS)"
  PASSWD_OBJS="$PASSWD_OBJS \$(PAM_OBJS)"
  INSTALL_PAM="install-pam"
fi
if test "$enable_pam_check_account_type" = yes; then
  COMMENT_PAM_CHECK_ACCOUNT=""
else
  COMMENT_PAM_CHECK_ACCOUNT="#"
fi
if test "$have_passwd_helper" = yes; then
  PASSWD_SRCS="$PASSWD_SRCS \$(PWHELPER_SRCS)"
  PASSWD_OBJS="$PASSWD_OBJS \$(PWHELPER_OBJS)"
fi
  PASSWD_SRCS="$PASSWD_SRCS \$(PWENT_SRCS)"
  PASSWD_OBJS="$PASSWD_OBJS \$(PWENT_OBJS)"


if test "$enable_locking" = yes; then
  LOCK_SRCS='$(LOCK_SRCS_1) $(PASSWD_SRCS)'
  LOCK_OBJS='$(LOCK_OBJS_1) $(PASSWD_OBJS)'
else
  LOCK_SRCS='$(NOLOCK_SRCS_1)'
  LOCK_OBJS='$(NOLOCK_OBJS_1)'
fi

if test "$ac_macosx" = yes; then
  EXES_OSX='$(EXES_OSX)'
  SCRIPTS_OSX='$(SCRIPTS_OSX)'
  MEN_OSX='$(MEN_OSX)'
else
  EXES_OSX=
  SCRIPTS_OSX=
  MEN_OSX=
fi


INSTALL_SETUID='$(INSTALL_PROGRAM) $(SUID_FLAGS)'

if test "$need_setuid" = yes; then
  NEED_SETUID=yes
else
  NEED_SETUID=no
fi

if test "$setuid_hacks" = yes; then
  SETUID_HACKS=yes
else
  SETUID_HACKS=no
fi

if test "$have_libcap" = yes; then
  SETCAP_HACKS=yes
else
  SETCAP_HACKS=no
fi

tab='	'
if test "$have_gl" = yes; then
  GL_EXES='$(GL_EXES)'
  SUID_EXES='$(SUID_EXES)'
  RETIRED_GL_EXES='$(RETIRED_GL_EXES)'
  GL_UTIL_EXES='$(GL_UTIL_EXES)'
  GL_MEN='$(GL_MEN)'
  GL_KLUDGE=" "
else
  GL_KLUDGE="-"
fi

if test "$have_gle" = yes; then
  GLE_EXES='$(GLE_EXES)'
  GLE_KLUDGE=" "
else
  GLE_KLUDGE="-"
fi

if test "$have_jpeg" = yes -a "$have_gdk_pixbuf" = yes; then
 JPEG_EXES='$(JPEG_EXES)'
fi


# Another substitution in the XScreenSaver.ad.in file:
#
if test "$gnome_open_program" != ''; then
  GNOME24=''
  GNOME22='!	'
  NOGNOME='!	'
elif test "$gnome_url_show_program" != ''; then
  GNOME24='!	'
  GNOME22=''
  NOGNOME='!	'
else
  GNOME24='!	'
  GNOME22='!	'
  NOGNOME=''
fi


# Set PO_DATADIR to something sensible.
#
AC_MSG_CHECKING([for locale directory])
if test -n "$GTK_DATADIR" ; then
  PO_DATADIR="$GTK_DATADIR"
elif test "$have_gtk" = yes; then
  PO_DATADIR=`$pkg_config --variable=prefix gtk+-2.0`
  PO_DATADIR="$PO_DATADIR/share"
fi

if test -z "$PO_DATADIR" ; then
  #
  # #### Total fucking kludge --
  # Map /build/prefix/usr/X11R6/share/ to /build/prefix/usr/share/
  # but of course we need to expand all the nested variables to do that...
  #
  dd=`eval eval eval eval eval eval eval eval eval eval eval echo $datadir`
  PO_DATADIR=`echo $dd | sed 's@/X11R6/@/@'`
fi

AC_MSG_RESULT($PO_DATADIR/locale)


# canonicalize slashes.
HACK_CONF_DIR=`echo "${HACK_CONF_DIR}" | sed 's@/$@@;s@//*@/@g'`

# gcc 3.0 likes to issue this warning for every file:
#
# cc1: warning: changing search order for system directory "/usr/local/include"
# cc1: warning:   as it has already been specified as a non-system directory
#
# Yay.  We can only avoid that by deleting "-I${prefix}/include" from the list.
# Which *should* be totally redundant, and thus an ok thing to delete?
#
INCLUDES=`echo "$INCLUDES" | sed 's@ -I${prefix}/include@@g;'`


###############################################################################
#
#       Perform substitutions and write Makefiles.
#
###############################################################################

AC_SUBST(INCLUDES)

AC_SUBST(PREFERRED_DEMO_PROGRAM)
AC_SUBST(ALL_DEMO_PROGRAMS)
AC_SUBST(SAVER_LIBS)
AC_SUBST(MOTIF_LIBS)
AC_SUBST(GTK_LIBS)
AC_SUBST(XML_LIBS)
AC_SUBST(PNG_LIBS)
AC_SUBST(JPEG_LIBS)
AC_SUBST(HACK_LIBS)
AC_SUBST(PTY_LIBS)
AC_SUBST(GL_LIBS)
AC_SUBST(GLE_LIBS)
AC_SUBST(XDPMS_LIBS)
AC_SUBST(XINERAMA_LIBS)
AC_SUBST(PASSWD_LIBS)
AC_SUBST(LIBCAP_CFLAGS)
AC_SUBST(LIBCAP_LIBS)
AC_SUBST(PROG_SETCAP)
AC_SUBST(INSTALL_SETUID)
AC_SUBST(SETUID_HACKS)
AC_SUBST(SETCAP_HACKS)
AC_SUBST(INSTALL_DIRS)
AC_SUBST(NEED_SETUID)
AC_SUBST(INSTALL_PAM)
AC_SUBST(HAVE_PAM_FAIL_DELAY)
AC_SUBST(COMMENT_PAM_CHECK_ACCOUNT)
AC_SUBST(NEW_LOGIN_COMMAND)
AC_SUBST(NEW_LOGIN_COMMAND_P)
AC_SUBST(DEFAULT_IMAGES_P)
AC_SUBST(DEFAULT_IMAGE_DIRECTORY)
AC_SUBST(DEFAULT_TEXT_FILE)
AC_SUBST(WITH_BROWSER)

AC_SUBST(OBJCC)
AC_SUBST(EXES_OSX)
AC_SUBST(EXES_SYSTEMD)
AC_SUBST(SCRIPTS_OSX)
AC_SUBST(MEN_OSX)

AC_SUBST(PASSWD_SRCS)
AC_SUBST(PASSWD_OBJS)
AC_SUBST(XMU_SRCS)
AC_SUBST(XMU_OBJS)
AC_SUBST(XMU_LIBS)
AC_SUBST(XFT_SRCS)
AC_SUBST(XFT_OBJS)
AC_SUBST(XFT_LIBS)
AC_SUBST(SAVER_GL_SRCS)
AC_SUBST(SAVER_GL_OBJS)
AC_SUBST(SAVER_GL_LIBS)
AC_SUBST(LOCK_SRCS)
AC_SUBST(LOCK_OBJS)
AC_SUBST(JPEG_EXES)
AC_SUBST(GL_EXES)
AC_SUBST(RETIRED_GL_EXES)
AC_SUBST(SUID_EXES)
AC_SUBST(GL_UTIL_EXES)
AC_SUBST(GL_MEN)
AC_SUBST(GL_KLUDGE)
AC_SUBST(GLE_EXES)
AC_SUBST(GLE_KLUDGE)
AC_SUBST(JWZGLES_OBJS)
AC_SUBST(GNOME24)
AC_SUBST(GNOME22)
AC_SUBST(NOGNOME)
AC_SUBST(HACKDIR)
AC_SUBST(HACKDIR_FULL)
AC_SUBST(GTK_DATADIR)
AC_SUBST(PO_DATADIR)
AC_SUBST(HACK_CONF_DIR)
AC_SUBST(GTK_EXTRA_OBJS)
AC_SUBST(ANIM_OBJS)
AC_SUBST(ANIM_LIBS)

APPDEFAULTS=$ac_x_app_defaults
AC_SUBST(APPDEFAULTS)

AC_SUBST(DEPEND)
AC_SUBST(DEPEND_FLAGS)
AC_SUBST(DEPEND_DEFINES)
AC_SUBST(PERL)

AC_OUTPUT(Makefile
          utils/Makefile
          jwxyz/Makefile
          hacks/Makefile
          hacks/images/Makefile
          hacks/glx/Makefile
          po/Makefile.in
          driver/Makefile
          driver/xscreensaver.pam
          driver/XScreenSaver.ad)

###############################################################################
#
#       Print some warnings at the end.
#
###############################################################################

warn_prefix_1="    Warning:"
warn_prefix_2="       Note:"
warn_prefix="$warn_prefix_1"

warning=no
warnsep='    #################################################################'

warnpre() {
  if test "$warning" = no ; then
    echo '' ; echo "$warnsep" ; echo ''
    warning=yes
  fi
}

warn() {
  warnpre
  if test "$warning" = long ; then echo '' ; fi
  warning=yes
  rest="$@"
  echo "$warn_prefix $rest"
}

warnL() {
  was=$warning
  warnpre
  warning=yes
  if test "$was" != no ; then echo '' ; fi
  rest="$@"
  echo "$warn_prefix $rest"
}

warn2() {
  rest="$@"
  echo "             $rest"
  warning=long
}

note() {
  warn_prefix="$warn_prefix_2"
  warn $@
  warn_prefix="$warn_prefix_1"
}

noteL() {
  warn_prefix="$warn_prefix_2"
  warnL $@
  warn_prefix="$warn_prefix_1"
}


# ac_prog_cc_no_pthread normally only happens on AIX, because according
# to AX_PTHREAD, AIX needs CC=xlc_r or CC=cc_r to do threads.
# If CC is specified, it takes precedence over --with-pthread.
if test "$ac_prog_cc_no_pthread" ; then
  warnL "You requested $ac_original_cc for the C compiler, but it doesn't"
  warn2 "support POSIX threads."
  echo ""
  warn2 "If you have multiple CPU cores, try CC=$PTHREAD_CC."
elif test "$with_pthread_req" = yes -a "$have_pthread" = no ; then
  warn 'POSIX threads were requested, but were not found.'
fi

if test "$with_sgi_req" = yes -a "$have_sgi" = no ; then
  warn 'The SGI saver extension was requested, but was not found.'
fi

if test "$with_xidle_req" = yes -a "$have_xidle" = no ; then
  warn 'The XIdle extension was requested, but was not found.'
fi

if test "$with_mit_req" = yes -a "$have_mit" = no ; then
  warn 'The MIT-SCREEN-SAVER extension was requested, but was not found.'
fi

if test "$with_xshm_req" = yes -a "$have_xshm" = no ; then
  warn 'The XSHM extension was requested, but was not found.'
fi

if test "$with_xdbe_req" = yes -a "$have_xdbe" = no ; then
  warn 'The DOUBLE-BUFFER extension was requested, but was not found.'
fi

if test "$with_sgivc_req" = yes -a "$have_sgivc" = no ; then
  warn 'The SGI-VIDEO-CONTROL extension was requested, but was not found.'
fi

if test "$with_dpms_req" = yes -a "$have_dpms" = no ; then
  warn 'The DPMS extension was requested, but was not found.'
fi

if test "$with_xinerama_req" = yes -a "$have_xinerama" = no ; then
  warn 'The Xinerama extension was requested, but was not found.'
fi

if test "$with_xf86vmode_req" = yes -a "$have_xf86vmode" = no ; then
  warn 'The XF86VMODE extension was requested, but was not found.'
fi

if test "$with_randr_req" = yes -a "$have_randr" = no ; then
  warn 'The RANDR extension was requested, but was not found.'
fi

if test "$with_proc_interrupts_req" = yes -a "$have_proc_interrupts" = no; then
  warn "Checking of /proc/interrupts was requested, but it's bogus."
fi

if test "$pkg_config" = false ; then
  warnL 'The "pkg-config" program was not found.  Without that,'
  warn2 "detection of the various GTK libraries won't work."
else
  pkgerr=`$pkg_config --list-all 2>&1 >/dev/null`
  if test "x$pkgerr" != "x" ; then
    warnL 'The "pkg-config" program produces errors.  This often causes'
    warn2 "detection of the various GTK libraries to malfunction."
    warn2 "The errors are:"
    echo ''
    echo "$pkgerr" | sed 's/^/             > /g'
  fi
fi

if test "$gtk_halfassed" != no ; then
  warnL "GTK version $gtk_halfassed was found, but at least one supporting"
  warn2 "library ($gtk_halfassed_lib) was not, so GTK can't be used."
  warn2 "Perhaps some of the development packages are not installed?"
  if test "$have_gtk" = yes ; then
    v="$ac_gtk_version_string"
    warn2 "GTK $v is also installed, so it will be used instead."
    warn2 "Please read the above output and the \`config.log' file"
    warn2 "for more details."
  fi
fi

motif_warn2() {
  warn2 'Though the Motif front-end to xscreensaver is still'
  warn2 'maintained, it is no longer being updated with new'
  warn2 'features: all new development on the xscreensaver-demo'
  warn2 'program is happening in the GTK version, and not in the'
  warn2 'Motif version.  It is recommended that you build against'
  warn2 'GTK instead of Motif.  See <http://www.gtk.org/>.'
}

if test "$have_motif" = no -a "$have_gtk" = no; then

  if test "$with_motif" = yes; then
    warnL "Neither the GTK nor Motif libraries were found; the"
    warn2 "\`xscreensaver-demo' program requires one of these."
    echo ''
    motif_warn2
  else
    warnL "The GTK libraries do not seem to be available; the"
    warn2 "\`xscreensaver-demo' program requires them."
#   echo ''
#   warn2 'You can use Motif or Lesstif instead of GTK (use the'
#   warn2 "\`--with-motif' option) but that is NOT recommended."
#   motif_warn2
  fi

elif test "$with_motif_req" = yes -a "$have_motif" = no ; then
  warnL "Use of Motif was requested, but it wasn't found;"
  warn2 "Gtk will be used instead."

elif test "$jurassic_gtk" = yes ; then

  pref_gtk=2.0

  v="$ac_gtk_version_string"
  if test "$with_gtk_req" = yes -a "$ac_gtk_version" = "unknown" ; then
    warnL "Use of Gtk was requested, but its version number is unknown;"
  elif test "$with_gtk_req" = yes ; then
    warnL "Use of Gtk was requested, but it is version $v;"
  else
    warnL "Gtk was found on this system, but it is version $v;"
  fi

  warn2 "Gtk $pref_gtk or newer is required."

elif test "$with_gtk_req" = yes -a "$have_gtk" = no ; then
  warnL "Use of Gtk was requested, but it wasn't found."
fi


if test "$have_gtk" = yes -a "$have_gdk_pixbuf" = no ; then
  warn  "GTK is being used, but the GDK-Pixbuf library and/or"
  warn2 "headers were not found.  That can't be good.  Please"
  warn2 "install the GDK-Pixbuf development kit and re-configure."
fi

if test "$have_motif" = yes -a "$have_lesstif" = yes ; then

  preferred_lesstif=0.92

  if test "$lesstif_version" = unknown; then
    warnL "Unable to determine the LessTif version number!"
    warn2 "Make sure you are using version $preferred_lesstif or newer."
    warn2 "See <http://www.lesstif.org/>."

  elif test \! $lesstif_version -gt 82; then
    warnL "LessTif version $lesstif_version_string is being used."
    warn2 "LessTif versions 0.82 and earlier are too buggy to"
    warn2 "use with XScreenSaver; it is strongly recommended"
    warn2 "that you upgrade to at least version $preferred_lesstif!"
    warn2 "See <http://www.lesstif.org/>."
  fi
fi


if test "$have_motif" = yes -a "$have_gtk" = no ; then
  warn  'Motif is being used, and GTK is not.'
  echo  ''
  motif_warn2
fi


if test "$with_gdk_pixbuf_req" = yes  -a "$have_gdk_pixbuf" = no; then
  warnL 'Use of GDK-Pixbuf was requested, but it was not found.'
fi

if test "$have_gdk_pixbuf" = no -o "$gdk_pixbuf_halfassed" = yes || \
   test "$have_gdk_pixbuf" = no ; then

  if test "$with_gdk_pixbuf_req" = yes ; then
    true
  elif test "$with_gdk_pixbuf_req" = no ; then
    warnL 'The GDK-Pixbuf library is not being used.'
  else
    warnL 'The GDK-Pixbuf library was not found.'
  fi

  if test "$gdk_pixbuf_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'libraries; so either GDK-Pixbuf is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
  fi

  if test "$have_png" = yes ; then
    echo ''
    warn2 'The PNG library is being used instead.'
  fi

  echo ''
  warn2 'Some of the demos will not use images as much as they could.'
  warn2 'You should consider installing GDK-Pixbuf and re-running'
  warn2 'configure.'
fi


if test "$have_jpeg" = no ; then
  if test "$with_jpeg_req" = yes ; then
    warnL 'Use of libjpeg was requested, but it was not found.'
  elif test "$with_jpeg_req" = no ; then
    noteL 'The JPEG library is not being used.'
  else
    noteL 'The JPEG library was not found.'
  fi

  if test "$jpeg_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'library; so either JPEG is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
    echo ''
  fi

  if test "$have_gdk_pixbuf" = no ; then
    warn2 "This means that it won't be possible for the image-manipulating"
    warn2 "display modes to load files from disk; and it also means that"
    warn2 "the \`webcollage' program will be much slower."
  else
    warn2 "This means the \`webcollage' program will be much slower."
  fi
fi


if test "$have_png" = no ; then
  if test "$with_png_req" = yes ; then
    warnL 'Use of libpng was requested, but it was not found.'
  elif test "$with_png_req" = no ; then
    noteL 'The PNG library is not being used.'
  else
    noteL 'The PNG library was not found.'
  fi

  if test "$png_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'library; so either PNG is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
    echo ''
  fi

  warn2 "Many things aren't going to work right."
fi


if test "$have_xft" = no ; then
  if test "$with_xft_req" = yes ; then
    warnL "Use of libXft was requested, but it was not found."
  elif test "$with_xft_req" = no ; then
    noteL 'The Xft library is not being used.'
  else
    noteL "The Xft library was not found."
  fi

  if test "$xft_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'libraries; so either Xft is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
    echo ''
  fi

  warn2 "This means that fonts won't be anti-aliased."
fi


if test "$have_bitmap_fonts" = no ; then
  warnL 'The standard bitmap fonts do not seem to be installed.'
  warn2 'That is not going to work out well for you.'
  warn2 'Install "xfonts-100dpi" or "xorg-x11-fonts-100dpi".'
fi


if test "$have_systemd" = no ; then
  systemd_warned=no
  if test "$systemd_too_old" = yes ; then
    warnL "The systemd library is too old."
    systemd_warned=yes
  elif test "$with_systemd_req" = yes ; then
    warnL "Use of systemd was requested, but it was not found."
    systemd_warned=yes
  elif test "$ac_macosx" = yes; then
    true
  elif test "$with_systemd_req" = no ; then
    noteL 'The systemd library is not being used.'
    systemd_warned=yes
  else
    warnL "The systemd library was not found."
    systemd_warned=yes
  fi

  if test "$systemd_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'libraries; so either systemd is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
    echo ''
    systemd_warned=yes
  fi

  if test "$systemd_warned" = yes; then
    echo ''
    warn2 "This means that xscreensaver-systemd won't be built."
    warn2 "Without that, xscreensaver will not be able to auto-lock"
    warn2 "before the system is suspended (e.g., closing laptop lid)"
    warn2 "and might activate while video playback is in progress."
  fi
fi


if test "$have_gl" = yes -a "$ac_have_mesa_gl" = yes ; then
  preferred_mesagl=3.4
  mgv="$ac_mesagl_version_string"
  pgl="$preferred_mesagl"

  if test "$ac_mesagl_version" = unknown; then
    true
    # warnL "Unable to determine the MesaGL version number!"
    # warn2 "Make sure you are using version $preferred_mesagl or newer."

  elif test \! "$ac_mesagl_version" -gt 2006; then
    warnL "MesaGL version number is $mgv --"
    warn2 "MesaGL 2.6 and earlier have a security bug.  It is strongly"
    warn2 "recommended that you upgrade to at least version $preferred_mesagl."

  elif test \! "$ac_mesagl_version" -gt 3003; then
    warnL "MesaGL version number is $mgv --"
    warn2 "MesaGL 3.3 and earlier have some bugs; it is recommended"
    warn2 "that you upgrade to $pgl or newer."
  fi
fi

if test "$have_gl" = no ; then
  if test "$with_gl_req" = yes ; then
    warnL 'Use of GL was requested, but it was not found.'
  elif test "$with_gl_req" = no ; then
    noteL 'The OpenGL 3D library is not being used.'
  else
    noteL 'The OpenGL 3D library was not found.'
  fi

  if test "$gl_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'libraries; so either GL is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
  fi

  echo ''
  warn2 'Those demos which use 3D will not be built or installed.'
  warn2 'You might want to consider installing OpenGL and'
  warn2 're-running configure.'

fi


if test "$have_gl" = yes -a "$have_gle" = no ; then

 # nobody cares about this; don't print the warning unless it was
 # requested and not found, or halfway-found.
 if test "$with_gle_req" = yes -o "$gle_halfassed" = yes ; then

  if test "$with_gle_req" = yes ; then
    noteL 'Use of the GLE (GL Extrusion) library was requested, but'
    warn2 'it was not found (though the OpenGL library was found, and'
    warn2 'is being used.)'
  elif test "$with_gle_req" = no ; then
    noteL 'The OpenGL Library is being used, but the GLE (GL Extrusion)'
    warn2 'library is not.'
  else
    noteL 'The OpenGL Library was found, but the GLE (GL Extrusion)'
    warn2 'library was not.'
  fi

  if test "$gle_halfassed" = yes ; then
    echo ''
    warn2 'More specifically, we found the headers, but not the'
    warn2 'libraries; so either GLE is half-installed on this'
    warn2 "system, or something else went wrong.  The \`config.log'"
    warn2 'file might contain some clues.'
  fi

  echo ''
  warn2 'Some of the OpenGL (3D) demos (those that depend on GLE)'
  warn2 'will not be built or installed.  You might want to consider'
  warn2 'installing GLE and re-running configure.  You can find the'
  warn2 'GLE library at <http://www.linas.org/gle/>'

 fi
fi


if test "$with_readdisplay_req" = yes -a "$have_readdisplay" = no ; then
  warn 'Use of XReadDisplay was requested, but it was not found.'
fi

if test "$with_kerberos_req" = yes -a "$have_kerberos" = no ; then
  warn 'Use of Kerberos was requested, but it was not found.'
fi

if test "$with_pam_req" = yes -a "$have_pam" = no ; then
  warn 'Use of PAM was requested, but it was not found.'
fi

if test "$with_shadow_req" = yes -a "$have_shadow" = no ; then
  warn 'Use of shadow passwords was requested, but they were not found.'
fi

if test "$setcap_hacks_req" = yes -a "$have_libcap" = no ; then
  warn 'Use of libcap was requested, but it was not found.'
fi

if test "$ac_macosx" = yes ; then
  if test "$enable_locking" = yes ; then
    warn  "You have specified --enable-locking on MacOS X."
    warn2 "THIS DOES NOT WORK!  Don't do this!"
  fi
fi


# You are in a twisty maze of namespaces and syntaxes, all alike.
# Fuck the skull of Unix.
#
bindir=`eval eval eval eval eval eval eval echo $bindir`
HACKDIR=`eval eval eval eval eval eval eval echo $HACKDIR`
HACK_CONF_DIR=`eval eval eval eval eval eval eval echo $HACK_CONF_DIR`

# canonicalize slashes.
bindir=`echo  "${bindir}"              | sed 's@/$@@;s@//*@/@g'`
HACKDIR=`echo "${HACKDIR}"             | sed 's@/$@@;s@//*@/@g'`
HACK_CONF_DIR=`echo "${HACK_CONF_DIR}" | sed 's@/$@@;s@//*@/@g'`


# Sanity check the hackdir
for bad_choice in xscreensaver xscreensaver-demo xscreensaver-command ; do
  if test "${HACKDIR}" = "${bindir}/${bad_choice}" ; then
    echo ""
    AC_MSG_ERROR([\"--with-hackdir=${bindir}/${bad_choice}\" won't work.
                   There will be an executable installed with that name, so
                   that can't be the name of a directory as well.  Please
                   re-configure with a different directory name.])
  fi
done


# Now let's warn if there's a previous RPM version already installed.
# But don't bother with this test if we are currently *building* an RPM.

if test -z "$RPM_PACKAGE_VERSION" ; then

  rpmnames="xscreensaver xscreensaver-base xscreensaver-extras"

  # M4 sucks!!
  changequote(X,Y)
  rpmv=`(rpm -qv $rpmnames) 2>/dev/null | \
        sed -n 's/^[-a-z]*-\([0-9][0-9]*[.][0-9][0-9a-z]*\)-.*$/\1/p' | \
        head -1`
  changequote([,])

  if test \! -z "$rpmv" ; then

    # M4 sucks!!
    changequote(A,B)
    rpmbdir=`rpm -ql $rpmnames | sed -n 's@^\(.*/\)xscreensaver-demo$@\1@p'`
    rpmhdir=`rpm -ql $rpmnames | sed -n 's@^\(.*/\)popsquares$@\1@p'`
    rpmcdir=`rpm -ql $rpmnames | sed -n 's@^\(.*/\)popsquares\.xml$@\1@p'`
    rpmadir=`rpm -ql $rpmnames | sed -n 's@^\(.*/\)XScreenSaver$@\1@p'`
    changequote([,])

    err=" (DIFFERS)"
    if test -z "$rpmbdir" ; then rpmbdir='???'
    elif test "$rpmbdir" != "${bindir}/"       ; then rpmbdir="$rpmbdir$err";fi

    if test -z "$rpmhdir" ; then rpmhdir='???'
    elif test "$rpmhdir" != "${HACKDIR}/"      ; then rpmhdir="$rpmhdir$err";fi

    if test -z "$rpmcdir" ; then rpmcdir='???'
    elif test "$rpmcdir" != "${HACK_CONF_DIR}/"; then rpmcdir="$rpmcdir$err";fi

    if test -z "$rpmadir" ; then rpmadir='???'
    elif test "$rpmadir" != "${APPDEFAULTS}/"  ; then rpmadir="$rpmadir$err";fi

    warning=no
    warnL "There is already an installed RPM of xscreensaver"
    warn2 "version \"$rpmv\" on this system."
    echo ""
    warn2 "It is currently installed in these directories:"
    echo ""
    warn2 "User programs: $rpmbdir$berr"
    warn2 "Screen savers: $rpmhdir$herr"
    warn2 "Configuration: $rpmcdir$cerr"
    warn2 "App Defaults:  $rpmadir$aerr"
  fi
fi

# Also warn if there's a Debian package installed.
#
debnames="xscreensaver xscreensaver-data xscreensaver-data-extra"
debv=''
for dpkg in $debnames ; do
  if test -z "$debv"; then
    debv=`dpkg -s $dpkg 2>/dev/null | sed -n 's/^Version: \(.*\)$/\1/p'`
  fi
done

if test \! -z "$debv" ; then

  # M4 sucks!!
  changequote(A,B)
  debbdir=`dpkg -L $debnames 2>&- | sed -n 's@^\(.*/bin/\)xscreensaver$@\1@p'`
  debhdir=`dpkg -L $debnames 2>&- | sed -n 's@^\(.*/\)popsquares$@\1@p'`
  debcdir=`dpkg -L $debnames 2>&- | sed -n 's@^\(.*/\)popsquares\.xml$@\1@p'`
  debadir=`dpkg -L $debnames 2>&- | sed -n 's@^\(.*/\)XScreenSaver[^/]*$@\1@p'`
  changequote([,])

  err=" (DIFFERS)"
  if test -z "$debbdir" ; then debbdir='???'
  elif test "$debbdir" != "${bindir}/"        ; then debbdir="$debbdir$err"; fi

  if test -z "$debhdir" ; then debhdir='???'
  elif test "$debhdir" != "${HACKDIR}/"       ; then debhdir="$debhdir$err"; fi

  if test -z "$debcdir" ; then debcdir='???'
  elif test "$debcdir" != "${HACK_CONF_DIR}/" ; then debcdir="$debcdir$err"; fi

  if test -z "$debadir" ; then debadir='???'
  elif test "$debadir" != "${APPDEFAULTS}/"   ; then debadir="$debadir$err"; fi

  warning=no
  warnL "There is already an installed dpkg of xscreensaver"
  warn2 "version \"$debv\" on this system."
  echo ""
  warn2 "It is currently installed in these directories:"
  echo ""
  warn2 "User programs: $debbdir$berr"
  warn2 "Screen savers: $debhdir$herr"
  warn2 "Configuration: $debcdir$cerr"
  warn2 "App Defaults:  $debadir$aerr"
fi

echo ""
echo "$warnsep"
echo ""
echo "    XScreenSaver will be installed in these directories:"
echo ""
echo "             User programs: ${bindir}/"
echo "             Screen savers: ${HACKDIR}/"
echo "             Configuration: ${HACK_CONF_DIR}/"
echo "             App Defaults:  ${APPDEFAULTS}/"
echo ""