diff --git a/mozilla/Makefile.in b/mozilla/Makefile.in
index 31f5731f8f2..e3e965dce4a 100644
--- a/mozilla/Makefile.in
+++ b/mozilla/Makefile.in
@@ -76,6 +76,14 @@ ifndef MOZ_NATIVE_JPEG
 DIRS		+= jpeg
 endif
 
+ifdef MOZ_ENABLE_XLIB
+DIRS           += gfx/src/xlibrgb widget/src/xlibxtbin
+endif
+
+ifdef MOZ_ENABLE_GTK
+DIRS           += widget/src/gtksuperwin widget/src/gtkxtbin
+endif
+
 # Linux and Solaris installer needs standalone libjar, hence standalone zlib
 ifneq (,$(filter Linux SunOS,$(OS_ARCH)))
 DIRS		+= modules/zlib/standalone