--- a/jdk/make/BuildJdk.gmk	Wed Feb 12 10:51:50 2014 -0800
+++ b/jdk/make/BuildJdk.gmk	Thu Feb 13 00:01:07 2014 +0100
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 1995, 2012, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -42,8 +42,8 @@
 # Include Profile information
 include ProfileNames.gmk
 
-# Include the corresponding custom file, if present.
--include $(CUSTOM_MAKE_DIR)/BuildJdk.gmk
+# Hook to include the corresponding custom file, if present.
+$(eval $(call IncludeCustomExtension, jdk, BuildJdk.gmk))
 
 import: import-only
 import-only: