--- a/jdk/make/lib/CoreLibraries.gmk	Tue Apr 12 00:43:57 2016 -0700
+++ b/jdk/make/lib/CoreLibraries.gmk	Wed Apr 13 11:13:15 2016 +0200
@@ -146,6 +146,7 @@
         $(LIBJAVA_CFLAGS), \
     System.c_CFLAGS := $(VERSION_CFLAGS), \
     jdk_util.c_CFLAGS := $(VERSION_CFLAGS), \
+    WARNINGS_AS_ERRORS_xlc := false, \
     DISABLED_WARNINGS_gcc := unused-result, \
     DISABLED_WARNINGS_solstudio := E_STATEMENT_NOT_REACHED, \
     MAPFILE := $(LIBJAVA_MAPFILE), \