gistfile1.txt

diff --git a/configure.ac b/configure.ac
index 0f5365b..725db46 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,7 +20,8 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 AC_LANG([C])
 
-AC_PROG_CC
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
 AM_PROG_CC_C_O
 AC_PROG_CXX
 AC_PROG_SED
@@ -331,8 +332,8 @@ if test -n "$PKG_CONFIG" ; then
 		HAVE_EXTERNAL_LIBS=1
 		enable_external_libs=yes
 
-		EXTERNAL_CFLAGS="$FLAC_CFLAGS $OGG_CFLAGS $VORBISENC_CFLAGS $SPEEX_CFLAGS"
-		EXTERNAL_LIBS="$FLAC_LIBS $VORBISENC_LIBS $SPEEX_LIBS"
+		EXTERNAL_CFLAGS="$FLAC_CFLAGS $OGG_CFLAGS $VORBIS_CFLAGS $VORBISENC_CFLAGS $SPEEX_CFLAGS"
+		EXTERNAL_LIBS="$FLAC_LIBS $OGG_LIBS $VORBIS_LIBS $VORBISENC_LIBS $SPEEX_LIBS "
 	else
 		echo
 		AC_MSG_WARN([[*** One or more of the external libraries (ie libflac, libogg and]])