Index: head/math/4ti2/Makefile
===================================================================
--- head/math/4ti2/Makefile	(revision 487833)
+++ head/math/4ti2/Makefile	(revision 487834)
@@ -1,25 +1,25 @@
 # $FreeBSD$
 
 PORTNAME=	4ti2
 DISTVERSIONPREFIX=	Release_
 DISTVERSION=	1_6_9
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Solve algebraic, geometric, combinatorial problems on linear spaces
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libglpk.so:math/glpk \
 		libgmp.so:math/gmp
 
-USES=		autoreconf gmake libtool
+USES=		autoreconf compiler:c++11-lang gmake libtool
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-static --enable-shared --with-glpk=${LOCALBASE} --with-gmp=${LOCALBASE}
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes
 
 TEST_TARGET=	check # tests fail to run: https://github.com/4ti2/4ti2/issues/26
 
 .include <bsd.port.mk>