Add an autogen.sh script as is customary for autoconf based

projects. Also update the documentation to steer people to
use this scripts.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10029 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

README.MSWindows.txt

@@ -214,12 +214,11 @@ in my dev directory:
  Configuring FLTK
 ------------------
 
-If you got FLTK via subversion then you need two extra steps. Otherwise skip
-over this part. Stay in your FLTK source-code directory. Type the following
-but ignore any errors from the second command:
-
-  autoconf
-  automake --add-missing
+If you got FLTK via subversion then you need one extra step. Otherwise skip
+over this part. Stay in your FLTK source-code directory and type the
+following:
+
+  NOCONFIGURE=1 ./autogen.sh
 
 Now configure your FLTK installation:
 

README.OSX.txt

@@ -91,12 +91,11 @@ dev directory:
  2.3  Configuring FLTK
 -----------------------
 
-If you got FLTK via subversion then you need two extra steps. Otherwise skip
-over this part. Stay in your FLTK source-code directory. Type the following
-but ignore any errors from the second command:
-
-  autoconf
-  automake --add-missing
+If you got FLTK via subversion then you need one extra step. Otherwise skip
+over this part. Stay in your FLTK source-code directory and type the
+following:
+
+  NOCONFIGURE=1 ./autogen.sh
 
 Now configure your FLTK installation:
 

README.Unix.txt

@@ -293,12 +293,11 @@ dev directory:
  3.2  Configuring FLTK
 -----------------------
 
-If you got FLTK via subversion then you need two extra steps. Otherwise skip
-over this part. Stay in your FLTK source-code directory. Type the following
-but ignore any errors from the second command:
-
-  autoconf
-  automake --add-missing
+If you got FLTK via subversion then you need one extra step. Otherwise skip
+over this part. Stay in your FLTK source-code directory and type the
+following:
+
+  NOCONFIGURE=1 ./autogen.sh
 
 Now configure your FLTK installation:
 

autogen.sh

@@ -0,0 +1,16 @@
+#! /bin/sh
+
+srcdir=`dirname $0`
+test -z "$srcdir" && srcdir=.
+srcdir=`cd $srcdir && pwd`
+
+ORIGDIR=`pwd`
+cd $srcdir
+
+autoconf --force || exit 1
+automake --add-missing
+if test ! -e config.sub; then echo NOTE: Using frozen copy of config.sub; cp misc/config.sub . ; fi
+if test ! -e config.guess; then echo NOTE: Using frozen copy of config.guess; cp misc/config.guess . ; fi
+cd $ORIGDIR || exit $?
+
+test -n "$NOCONFIGURE" || $srcdir/configure "$@"