--- a/common/autoconf/spec.gmk.in	Fri Mar 06 11:00:42 2015 -0800
+++ b/common/autoconf/spec.gmk.in	Mon Mar 09 10:39:16 2015 +0100
@@ -324,6 +324,7 @@
 C_FLAG_DEPS:=@C_FLAG_DEPS@
 CXX_FLAG_DEPS:=@CXX_FLAG_DEPS@
 
+DISABLE_WARNING_PREFIX := @DISABLE_WARNING_PREFIX@
 CFLAGS_WARNINGS_ARE_ERRORS:=@CFLAGS_WARNINGS_ARE_ERRORS@
 
 CFLAGS_CCACHE:=@CFLAGS_CCACHE@