Index: head/science/ncnn/Makefile
===================================================================
--- head/science/ncnn/Makefile	(revision 507476)
+++ head/science/ncnn/Makefile	(revision 507477)
@@ -1,23 +1,23 @@
 # $FreeBSD$
 
 PORTNAME=	ncnn
 DISTVERSION=	20190611-40
 DISTVERSIONSUFFIX=	-gd3be711
 CATEGORIES=	science
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	High-performance neural network inference framework
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
-USES=		cmake
+USES=		cmake compiler:c11
 USE_GITHUB=	yes
 GH_ACCOUNT=	Tencent
 
 post-install: # https://github.com/Tencent/ncnn/issues/1130
 	@${MKDIR} ${STAGEDIR}${PREFIX}/lib/cmake/${PORTNAME}
 	@${MV} ${STAGEDIR}${DATADIR}/* ${STAGEDIR}${PREFIX}/lib/cmake/${PORTNAME}
 	@${RMDIR} ${STAGEDIR}${DATADIR}
 
 .include <bsd.port.mk>