--- Makefile.orig	2015-03-03 22:45:06.218663287 +0100
+++ Makefile	2015-03-03 22:45:31.368638212 +0100
@@ -18,6 +18,9 @@
 
 .include "${.CURDIR}/Makefile.common"
 
+USES+=	cpe
+CPE_VENDOR=	gnu
+
 LANGS=			c c++ ada
 APPLY_DIFFS=		core cxx ada
 INTENDED_COMPILER=	NATIVE