--- Makefile.orig	2015-03-23 12:49:46.939800812 +0100
+++ Makefile	2015-03-23 12:50:33.325484382 +0100
@@ -9,6 +9,9 @@
 MAINTAINER=	emulation@FreeBSD.org
 COMMENT=	ASN.1 structure parser library
 
+USES+=	cpe
+CPE_VENDOR=	gnu
+
 USE_LINUX=	c6
 USE_LINUX_RPM=	yes