diff -p -up comm-1.9.1/mozilla/layout/build/Makefile.in.x11libs comm-1.9.1/mozilla/layout/build/Makefile.in
--- comm-1.9.1/mozilla/layout/build/Makefile.in.x11libs	2009-11-22 00:46:51.000000000 -0200
+++ comm-1.9.1/mozilla/layout/build/Makefile.in	2009-12-02 10:26:30.000000000 -0200
@@ -237,6 +237,7 @@ EXTRA_DSO_LDOPTS = \
 		$(MOZ_UNICHARUTIL_LIBS) \
 		$(MOZ_COMPONENT_LIBS) \
 		$(MOZ_JS_LIBS) \
+		-lX11 -lXrender \
 		$(NULL)
 
 ifdef MOZ_ENABLE_GTK2