oops, forget to check this in yesterday as part of bug #92034. a=brendan

config/autoconf.mk.in

@@ -270,6 +270,7 @@ MOZ_TOOLKIT_REGISTRY_CFLAGS = \
 	$(TK_CFLAGS)
 
 MOZ_ENABLE_GTK		= @MOZ_ENABLE_GTK@
+MOZ_ENABLE_GTK2		= @MOZ_ENABLE_GTK2@
 MOZ_ENABLE_MOTIF	= @MOZ_ENABLE_MOTIF@
 MOZ_ENABLE_XLIB		= @MOZ_ENABLE_XLIB@
 MOZ_ENABLE_QT		= @MOZ_ENABLE_QT@
@@ -279,6 +280,9 @@ MOZ_ENABLE_XREMOTE	= @MOZ_ENABLE_XREMOTE@
 MOZ_GTK_CFLAGS		= @MOZ_GTK_CFLAGS@
 MOZ_GTK_LDFLAGS		= @MOZ_GTK_LDFLAGS@
 
+MOZ_GTK2_CFLAGS		= @MOZ_GTK2_CFLAGS@
+MOZ_GTK2_LDFLAGS	= @MOZ_GTK2_LDFLAGS@
+
 MOZ_MOTIF_CFLAGS	= @MOZ_MOTIF_CFLAGS@
 MOZ_MOTIF_LDFLAGS	= @MOZ_MOTIF_LDFLAGS@