Index: head/math/clingo/Makefile
===================================================================
--- head/math/clingo/Makefile	(revision 517756)
+++ head/math/clingo/Makefile	(revision 517757)
@@ -1,25 +1,25 @@
 # $FreeBSD$
 
 PORTNAME=	clingo
 DISTVERSIONPREFIX=	v
 DISTVERSION=	5.4.0
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Grounder and solver for logic programs
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.md
 
 BUILD_DEPENDS=	re2c:devel/re2c
 
-USES=		cmake
+USES=		cmake compiler:c++14-lang
 USE_GITHUB=	yes
 GH_ACCOUNT=	potassco
 GH_TUPLE=	potassco:clasp:c183473:clasp/clasp
 USE_LDCONFIG=	yes
 
 CMAKE_OFF=	CLINGO_BUILD_WITH_PYTHON # broken, see https://github.com/potassco/clingo/issues/178
 CMAKE_OFF+=	CLINGO_BUILD_WITH_LUA
 
 .include <bsd.port.mk>