diff --git a/ChangeLog b/ChangeLog
index 7ea24a4e5e..9b8bfcd7a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2005-07-01  Jan Schmidt  <thaytan@mad.scientist.com>
+
+	* configure.ac:
+	* ext/mad/Makefile.am:
+	* sys/oss/Makefile.am:
+	Roll gstreamer-interfaces-0.9.pc into gstreamer-plugins-base-0.9.pc
+
 2005-07-01  Jan Schmidt  <thaytan@mad.scientist.com>
 	* ext/libcaca/Makefile.am:
 	* ext/mad/Makefile.am:
diff --git a/configure.ac b/configure.ac
index 60650820f8..c58f654a96 100644
--- a/configure.ac
+++ b/configure.ac
@@ -244,18 +244,7 @@ fi
 AC_SUBST(GST_BASE_LIBS)
 AC_SUBST(GST_BASE_CFLAGS)
 
-dnl check for gstreamer-interfaces; uinstalled is selected preferentially
-PKG_CHECK_MODULES(GST_INTERFACES, gstreamer-interfaces-$GST_MAJORMINOR >= $GST_REQ,
-  HAVE_GST_INTERFACES="yes", HAVE_GST_INTERFACES="no")
-
-if test "x$HAVE_GST_INTERFACES" = "xno"; then
-  AC_MSG_ERROR(no GStreamer Interfaces Libs found)
-fi
-
-AC_SUBST(GST_INTERFACES_LIBS)
-AC_SUBST(GST_INTERFACES_CFLAGS)
-
-dnl check for gstreamer-interfaces; uinstalled is selected preferentially
+dnl check for gstreamer-plugins-base; uinstalled is selected preferentially
 PKG_CHECK_MODULES(GST_PLUGINS_BASE,
   gstreamer-plugins-base-$GST_MAJORMINOR >= $GST_REQ,
   HAVE_GST_PLUGINS_BASE="yes", HAVE_GST_PLUGINS_BASE="no")
diff --git a/sys/oss/Makefile.am b/sys/oss/Makefile.am
index 69c128ebf0..69e0144f33 100644
--- a/sys/oss/Makefile.am
+++ b/sys/oss/Makefile.am
@@ -8,7 +8,7 @@ libgstossaudio_la_SOURCES = gstossaudio.c	\
 
 libgstossaudio_la_CFLAGS = $(GST_CFLAGS)
 libgstossaudio_la_LIBADD = $(top_builddir)/gst-libs/gst/libgstinterfaces-@GST_MAJORMINOR@.la
-libgstossaudio_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) $(GST_INTERFACES_LIBS)
+libgstossaudio_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) $(GST_PLUGINS_BASE_LIBS)
 
 noinst_HEADERS = gstosssink.h	\
 		gstosssrc.h	\