- GST_CHECK_MPEG2DEC macro - checks for mpeg2dec in /usr/lib.

Original commit message from CVS:
- GST_CHECK_MPEG2DEC macro - checks for mpeg2dec in /usr/lib.
If not found then checks for mpeg2dec in /usr/X11R6/lib.

This macro is needed because mpeg2dec depends on X11R6 libraries
and as FHS states, it should be placed in /usr/X11R6 tree but
some distros do not care and put mpeg2dec into /usr/lib.

It depends on CHECK_LIBHEADER macro.

diff --git a/m4/gst-mpeg2dec.m4 b/m4/gst-mpeg2dec.m4
new file mode 100644 (file)
index 0000000..aa3f108
--- /dev/null
+++ b/m4/gst-mpeg2dec.m4
@@ -0,0 +1,24 @@
+AC_DEFUN(GST_CHECK_MPEG2DEC, 
+[dnl
+dnl
+dnl check for mpeg2dec in standard location
+dnl if not found then check for mpeg2dec in /usr/X11R6/lib
+dnl
+CHECK_LIBHEADER(MPEG2DEC, mpeg2, mpeg2_init, mpeg2dec/mpeg2.h, MPEG2DEC_LIBS="-lmpeg2 -lmpeg2dec")
+ 
+dnl unset cache variable - we want to check once again for the same library
+dnl but in different location
+unset ac_cv_lib_mpeg2_mpeg2_init
+
+dnl check again in /usr/X11R6/lib
+if test x$HAVE_MPEG2DEC = xno; then
+    AC_MSG_NOTICE([NOTICE: mpeg2dec not found, let's try again in /usr/X11R6])
+    CHECK_LIBHEADER(MPEG2DEC, mpeg2, mpeg2_init, mpeg2dec/mpeg2.h, [
+            MPEG2DEC_LIBS="-lmpeg2 -lmpeg2dec -L/usr/X11R6/lib"
+            MPEG2DEC_CFLAGS="-I/usr/X11R6/include"
+        ], , -L/usr/X11R6/lib, -I/usr/X11R6/include)
+fi
+
+AC_SUBST(MPEG2DEC_CFLAGS)
+AC_SUBST(MPEG2DEC_LIBS)
+])