--- a/gstreamer_core/gst/gstinterface.h	Wed Mar 24 17:58:42 2010 -0500
+++ b/gstreamer_core/gst/gstinterface.h	Wed Mar 24 18:04:17 2010 -0500
@@ -32,13 +32,8 @@
 #define GST_IMPLEMENTS_INTERFACE(obj) \
   (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_IMPLEMENTS_INTERFACE, \
 				      GstImplementsInterface))
-#define GST_IMPLEMENTS_INTERFACE_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_IMPLEMENTS_INTERFACE, \
-			    GstImplementsInterfaceClass))
 #define GST_IS_IMPLEMENTS_INTERFACE(obj) \
   (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_IMPLEMENTS_INTERFACE))
-#define GST_IS_IMPLEMENTS_INTERFACE_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_IMPLEMENTS_INTERFACE))
 #define GST_IMPLEMENTS_INTERFACE_GET_CLASS(inst) \
   (G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_IMPLEMENTS_INTERFACE, \
 				  GstImplementsInterfaceClass))