Index: vorbis-tools/configure.in
--- vorbis-tools~pkgconfig/configure.in	2004-06-10 17:00:38.166126648 +0200
+++ vorbis-tools/configure.in	2004-06-10 17:00:46.818811240 +0200
@@ -101,8 +101,47 @@
 dnl Check for generally needed libraries
 dnl --------------------------------------------------
 
-XIPH_PATH_OGG(,AC_MSG_ERROR(Ogg needed!))
-XIPH_PATH_VORBIS(,AC_MSG_ERROR(Vorbis needed!))
+HAVE_OGG=no
+dnl first check through pkg-config
+dnl check for pkg-config itself so we don't try the m4 macro without pkg-config
+AC_CHECK_PROG(HAVE_PKG_CONFIG, pkg-config, yes)
+if test "x$HAVE_PKG_CONFIG" = "xyes"
+then
+  PKG_CHECK_MODULES(OGG, ogg >= 1.0, HAVE_OGG=yes, HAVE_OGG=no)
+fi
+if test "x$HAVE_OGG" = "xno"
+then
+  dnl fall back to the old school test
+  XIPH_PATH_OGG(,AC_MSG_ERROR(Ogg needed!))
+  libs_save=$LIBS
+  LIBS="$OGG_LIBS $VORBIS_LIBS"
+  AC_CHECK_FUNC(oggpack_writealign, , AC_MSG_ERROR(Ogg >= 1.0 required !))
+  LIBS=$libs_save
+fi
+
+dnl check for Vorbis
+HAVE_VORBIS=no
+
+dnl first check through pkg-config since it's more flexible
+
+if test "x$HAVE_PKG_CONFIG" = "xyes"
+then
+  PKG_CHECK_MODULES(VORBIS, vorbis >= 1.0.1, HAVE_VORBIS=yes, HAVE_VORBIS=no)
+  dnl also set VORBISENC_LIBS since an examples needs it
+  dnl the old .m4 sets this to a value to use on top of VORBIS_LIBS,
+  dnl so we do the same here.
+  VORBISENC_LIBS="-lvorbisenc"
+  VORBISFILE_LIBS="-lvorbisfile"
+  AC_SUBST(VORBISENC_LIBS)
+  AC_SUBST(VORBISFILE_LIBS)
+fi
+if test "x$HAVE_VORBIS" = "xno"
+then
+  dnl fall back to the old school test
+  XIPH_PATH_VORBIS(,AC_MSG_ERROR(Vorbis needed!))
+fi
+
+
 
 SHARE_LIBS='$(top_builddir)/share/libutf8.a $(top_builddir)/share/libgetopt.a'
 SHARE_CFLAGS='-I$(top_srcdir)/include'