Index: head/games/avp/Makefile
===================================================================
--- head/games/avp/Makefile	(revision 519610)
+++ head/games/avp/Makefile	(revision 519611)
@@ -1,27 +1,27 @@
 # Created by: Piotr Kubaj <pkubaj@anongoth.pl>
 # $FreeBSD$
 
 PORTNAME=	avp
 DISTVERSION=	20170505
 CATEGORIES=	games
 MASTER_SITES=	https://icculus.org/avp/files/
 EXTRACT_SUFX=	-a1.tar.gz
 
 MAINTAINER=	pkubaj@FreeBSD.org
 COMMENT=	Open source re-implementation of Alien versus Predator
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		cmake gl openal sdl
+USES=		cmake compiler:c++11-lang gl openal sdl
 USE_GL=		gl
 USE_SDL=	sdl
 
 LLD_UNSAFE=	yes
 PLIST_FILES=	bin/${PORTNAME}
 
 do-install:
 	${INSTALL_PROGRAM} ${BUILD_WRKSRC}/${PORTNAME} \
 		${STAGEDIR}${PREFIX}/bin/
 
 .include <bsd.port.mk>