Fix libm linking error

Makefile.in

@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.14 from Makefile.am.
+# Makefile.in generated by automake 1.14.1 from Makefile.am.
 # @configure_input@
 
 # Copyright (C) 1994-2013 Free Software Foundation, Inc.
@@ -547,9 +547,10 @@ distcheck: dist
 	  && dc_destdir="$${TMPDIR-/tmp}/am-dc-$$$$/" \
 	  && am__cwd=`pwd` \
 	  && $(am__cd) $(distdir)/_build \
-	  && ../configure --srcdir=.. --prefix="$$dc_install_base" \
+	  && ../configure \
 	    $(AM_DISTCHECK_CONFIGURE_FLAGS) \
 	    $(DISTCHECK_CONFIGURE_FLAGS) \
+	    --srcdir=.. --prefix="$$dc_install_base" \
 	  && $(MAKE) $(AM_MAKEFLAGS) \
 	  && $(MAKE) $(AM_MAKEFLAGS) dvi \
 	  && $(MAKE) $(AM_MAKEFLAGS) check \

aclocal.m4

@@ -1,4 +1,4 @@
-# generated automatically by aclocal 1.14 -*- Autoconf -*-
+# generated automatically by aclocal 1.14.1 -*- Autoconf -*-
 
 # Copyright (C) 1996-2013 Free Software Foundation, Inc.
 
@@ -35,7 +35,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION],
 [am__api_version='1.14'
 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
 dnl require some minimum version.  Point them to the right macro.
-m4_if([$1], [1.14], [],
+m4_if([$1], [1.14.1], [],
       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
 ])
 
@@ -51,7 +51,7 @@ m4_define([_AM_AUTOCONF_VERSION], [])
 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-[AM_AUTOMAKE_VERSION([1.14])dnl
+[AM_AUTOMAKE_VERSION([1.14.1])dnl
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
@@ -573,7 +573,8 @@ to "yes", and re-run configure.
 END
     AC_MSG_ERROR([Your 'rm' program is bad, sorry.])
   fi
-fi])
+fi
+])
 
 dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
 dnl add the conditional right here, as _AC_COMPILER_EXEEXT may be further

configure

@@ -2734,6 +2734,7 @@ END
     as_fn_error $? "Your 'rm' program is bad, sorry." "$LINENO" 5
   fi
 fi
+
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -3774,10 +3775,56 @@ fi
 
 
 
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ceil in -lm" >&5
+$as_echo_n "checking for ceil in -lm... " >&6; }
+if ${ac_cv_lib_m_ceil+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lm  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char ceil ();
+int
+main ()
+{
+return ceil ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_m_ceil=yes
+else
+  ac_cv_lib_m_ceil=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_ceil" >&5
+$as_echo "$ac_cv_lib_m_ceil" >&6; }
+if test "x$ac_cv_lib_m_ceil" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBM 1
+_ACEOF
+
+  LIBS="-lm $LIBS"
+
+fi
+
+
 EXTRA_INCLUDES=""
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libtiff" >&5
 $as_echo_n "checking for libtiff... " >&6; }
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for TIFFGetField in -ltiff" >&5
 $as_echo_n "checking for TIFFGetField in -ltiff... " >&6; }
 if ${ac_cv_lib_tiff_TIFFGetField+:} false; then :
@@ -4353,7 +4400,7 @@ fi
 
 EXTRA_INCLUDES=$EXTRA_INCLUDES
 
-LIBS="-lgeotiff -ltiff"
+LIBS="$LIBS -lgeotiff -ltiff"
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable maintainer-specific portions of Makefiles" >&5
 $as_echo_n "checking whether to enable maintainer-specific portions of Makefiles... " >&6; }

configure.ac

@@ -2,6 +2,8 @@ AC_INIT([convert_geotiff], [0.1.0], [jon.beezley@gmail.com], [convert_geotiff],
 AM_INIT_AUTOMAKE([foreign])
 AC_PROG_CC
 
+AC_CHECK_LIB([m],[ceil])
+
 EXTRA_INCLUDES=""
 AC_MSG_CHECKING([for libtiff])
 AC_CHECK_LIB([tiff], [TIFFGetField], [HAVE_TIFF=yes], [AC_MSG_ERROR([Cannot find TIFF library.  Try setting CFLAGS and LDFLAGS if it is installed in a non-standard location.])],[])
@@ -24,7 +26,7 @@ AC_CHECK_HEADER([geotiffio.h], [
         [AC_MSG_ERROR([Cannot find GEOTIFF headers])],[])],[])
 
 AC_SUBST(EXTRA_INCLUDES,$EXTRA_INCLUDES)
-LIBS="-lgeotiff -ltiff"
+LIBS="-lgeotiff -ltiff $LIBS"
 AM_MAINTAINER_MODE([enable])
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT