--- a/javatools/subsystem.mk	Fri May 14 15:47:24 2010 +0300
+++ b/javatools/subsystem.mk	Thu May 27 12:49:31 2010 +0300
@@ -48,6 +48,10 @@
 
 endif
 
+# Declare that release preparation removes subdirectories not in build, except
+# listed special cases
+REMOVE_NOTBUILT_EXCLUDING = releng 
+
 include ${JAVA_SRC_ROOT}/build/Makefile.subsystem