diff --git a/mozilla/modules/plugin/Makefile.in b/mozilla/modules/plugin/Makefile.in
index 33f72598df3..343b1ee40c7 100644
--- a/mozilla/modules/plugin/Makefile.in
+++ b/mozilla/modules/plugin/Makefile.in
@@ -29,8 +29,14 @@ include $(DEPTH)/config/autoconf.mk
 DIRS		= public nglsrc
 
 ifdef ENABLE_TESTS
+
+# This test relies on GTK libraries and header files, it is not
+#  buildable on other non-GTK uinix builds
+ifdef MOZ_ENABLE_GTK
 DIRS		+= test
 endif
+
+endif
  
 include $(topsrcdir)/config/rules.mk