Index: head/lang/gravity/Makefile
===================================================================
--- head/lang/gravity/Makefile	(revision 512240)
+++ head/lang/gravity/Makefile	(revision 512241)
@@ -1,20 +1,20 @@
 # $FreeBSD$
 
 PORTNAME=	gravity
 DISTVERSION=	0.7.5
 CATEGORIES=	lang
 PKGNAMESUFFIX=	-lang
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Embeddable programming language
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		cmake
+USES=		cmake compiler:c11
 USE_GITHUB=	yes
 GH_ACCOUNT=	marcobambini
 
 PLIST_FILES=	bin/${PORTNAME}
 
 .include <bsd.port.mk>