Index: head/math/py-kiwisolver/Makefile
===================================================================
--- head/math/py-kiwisolver/Makefile	(revision 543882)
+++ head/math/py-kiwisolver/Makefile	(revision 543883)
@@ -1,18 +1,18 @@
 # $FreeBSD$
 
 PORTNAME=	kiwisolver
 PORTVERSION=	1.1.0
 PORTEPOCH=	1
 CATEGORIES=	math python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	lbartoletti@FreeBSD.org
 COMMENT=	Fast implementation of the Cassowary constraint solver
 
 LICENSE=	BSD3CLAUSE
 
-USES=		python
+USES=		compiler:c++11-lang python
 USE_PYTHON=	autoplist concurrent distutils
 
 .include <bsd.port.mk>