--- old/common/autoconf/spec.gmk.in	2013-01-24 19:58:41.612904709 +0100
+++ new/common/autoconf/spec.gmk.in	2013-01-24 19:58:41.524904707 +0100
@@ -434,6 +434,11 @@
 
 JARSIGNER=@FIXPATH@ $(BOOT_JDK)/bin/jarsigner
 
+# You run the new javac using the boot jdk with $(BOOT_JDK)/bin/java $(NEW_JAVAC) ...
+BOOTSTRAP_JAVAC_JARS:="-Xbootclasspath/p:$(LANGTOOLS_OUTPUTDIR)/dist/bootstrap/lib/javac.jar" -cp $(LANGTOOLS_OUTPUTDIR)/dist/bootstrap/lib/javac.jar
+NEW_JAVAC   = $(BOOTSTRAP_JAVAC_JARS) com.sun.tools.javac.Main
+NEW_JAVADOC = $(BOOTSTRAP_JAVAC_JARS) com.sun.tools.javadoc.Main
+
 # Base flags for RC
 # Guarding this against resetting value. Legacy make files include spec multiple
 # times.