--- a/make/Main.gmk	Tue Feb 11 10:44:23 2014 +0100
+++ b/make/Main.gmk	Thu Feb 13 00:00:20 2014 +0100
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 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
@@ -31,8 +31,8 @@
 # Load the vital tools for all the makefiles.
 include $(SRC_ROOT)/make/common/MakeBase.gmk
 
-# Include the corresponding custom file, if present.
--include $(CUSTOM_MAKE_DIR)/Main.gmk
+# Hook to include the corresponding custom file, if present.
+$(eval $(call IncludeCustomExtension, , Main.gmk))
 
 ### Clean up from previous run