--- libgig/trunk/configure.in	2004/07/02 19:37:09	168
+++ libgig/trunk/configure.in	2007/05/06 16:20:51	1173
@@ -1,7 +1,34 @@
 AC_INIT(configure.in)
-AM_CONFIG_HEADER(config.h)
 
-AM_INIT_AUTOMAKE(libgig, 0.7.1)
+#------------------------------------------------------------------------------------
+# Library's "official" release version:
+
+LIBGIG_RELEASE_MAJOR=3
+LIBGIG_RELEASE_MINOR=1
+LIBGIG_RELEASE_BUILD=1
+
+#------------------------------------------------------------------------------------
+# The following is the libtool / shared library version. This doesn't have to
+# do anything with the release version. It MUST conform to the following rules:
+#
+#  1. Start with version information of `0:0:0' for each libtool library.
+#  2. Update the version information only immediately before a public release of
+#     your software. More frequent updates are unnecessary, and only guarantee
+#     that the current interface number gets larger faster.
+#  3. If the library source code has changed at all since the last update, then
+#     increment revision (`c:r:a' becomes `c:r+1:a').
+#  4. If any interfaces have been added, removed, or changed since the last update,
+#     increment current, and set revision to 0.
+#  5. If any interfaces have been added since the last public release, then increment
+#     age.
+#  6. If any interfaces have been removed since the last public release, then set age
+#     to 0.
+
+LIBGIG_LT_CURRENT=7
+LIBGIG_LT_REVISION=0
+LIBGIG_LT_AGE=1
+SHARED_VERSION_INFO="$LIBGIG_LT_CURRENT:$LIBGIG_LT_REVISION:$LIBGIG_LT_AGE"
+
 
 AC_C_BIGENDIAN
 
@@ -9,4 +36,37 @@
 AC_PROG_CXX
 AM_PROG_LIBTOOL
 
-AC_OUTPUT(Makefile src/Makefile libgig.spec libgig.pc Doxyfile)
+AC_SUBST(SHLIB_VERSION_ARG)
+AC_SUBST(SHARED_VERSION_INFO)
+
+have_audio_file_lib="false"
+
+# check for presence of libsndfile
+PKG_CHECK_MODULES(SNDFILE, sndfile >= 1.0.2, ac_cv_sndfile=1, ac_cv_sndfile=0)
+AM_CONDITIONAL(HAVE_SNDFILE, test $ac_cv_sndfile = "1")
+AC_DEFINE_UNQUOTED([HAVE_SNDFILE],${ac_cv_sndfile}, [Set to 1 if you have libsndfile.])
+AC_SUBST(SNDFILE_CFLAGS)
+AC_SUBST(SNDFILE_LIBS)
+if test "$ac_cv_sndfile" = "1"; then
+    have_audio_file_lib="true";
+else
+    # no libsndfile? then check for presence of libaudiofile
+    PKG_CHECK_MODULES(AUDIOFILE, audiofile >= 0.2.3, ac_cv_audiofile=1, ac_cv_audiofile=0)
+    AC_DEFINE_UNQUOTED([HAVE_AUDIOFILE],${ac_cv_audiofile}, [Set to 1 if you have libaudiofile.])
+    AC_SUBST(AUDIOFILE_CFLAGS)
+    AC_SUBST(AUDIOFILE_LIBS)
+    if test "$ac_cv_audiofile" = "1"; then
+        have_audio_file_lib="true";
+    fi
+fi
+if test "$have_audio_file_lib" = "false"; then
+    echo "No audio file library found!"
+    echo "Sorry, you need either libsndfile or libaudiofile to compile libgig."
+    echo "This is needed for the gigextract utility to write audio files."
+    exit -1;
+fi
+
+AM_CONFIG_HEADER(config.h)
+AM_INIT_AUTOMAKE(libgig, "$LIBGIG_RELEASE_MAJOR.$LIBGIG_RELEASE_MINOR.$LIBGIG_RELEASE_BUILD")
+
+AC_OUTPUT(Makefile doc/Makefile man/Makefile src/Makefile libgig.spec gig.pc Doxyfile man/dlsdump.1 man/gigdump.1 man/gigextract.1 man/rifftree.1 debian/Makefile src/testcases/Makefile win32/Makefile osx/Makefile osx/libgig.xcodeproj/Makefile)