This is a bug report. I was trying to build openjdk6, and make sanity got duplicated BUILD_JDK = true lines in the output.
Looking at control/make/make/sanity-rules.gmk, I see duplicate lines ifeq ($(JDK_SRC_AVAILABLE), true) @$(ECHO) " BUILD_JDK = $(BUILD_JDK) " >> $(MESSAGE_FILE) endif ifeq ($(JDK_SRC_AVAILABLE), true) @$(ECHO) " BUILD_JDK = $(BUILD_JDK) " >> $(MESSAGE_FILE) endif Delete one of the above. Martin