Index: head/math/sympol/Makefile
===================================================================
--- head/math/sympol/Makefile	(revision 559909)
+++ head/math/sympol/Makefile	(revision 559910)
@@ -1,29 +1,29 @@
 # $FreeBSD$
 
 PORTNAME=	sympol
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.1.9
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ library and tool to work with symmetric polyhedra
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	permlib>0:math/permlib
 LIB_DEPENDS=	libboost_program_options.so:devel/boost-libs \
 		libcddgmp.so:math/cddlib \
 		libgmp.so:math/gmp
 
-USES=		cmake eigen:3 localbase:ldflags
+USES=		cmake compiler:c++11-lang eigen:3 localbase:ldflags
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	tremlin
 GH_PROJECT=	SymPol
 
 post-install:
 	@${RM} ${STAGEDIR}${PREFIX}/lib/libcddgmp.so
 
 .include <bsd.port.mk>