Index: head/science/py-pygmo2/Makefile
===================================================================
--- head/science/py-pygmo2/Makefile	(revision 538470)
+++ head/science/py-pygmo2/Makefile	(revision 538471)
@@ -1,28 +1,28 @@
 # $FreeBSD$
 
 PORTNAME=	pygmo2
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.15.0-121
 DISTVERSIONSUFFIX=	-gbe6c148
 CATEGORIES=	science graphics
 #MASTER_SITES=	CHEESESHOP # https://github.com/esa/pygmo2/issues/53
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Python platform to perform parallel computations of optimisation tasks
 
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	pybind11>0:devel/pybind11
 LIB_DEPENDS=	libpagmo.so:science/pagmo2 \
 		libboost_serialization.so:devel/boost-libs
 
-USES=		cmake python
+USES=		cmake compiler:c++11-lang python
 USE_GITHUB=	yes
 GH_ACCOUNT=	esa
 GH_PROJECT=	pygmo2
 
 CMAKE_ON=	PYGMO_ENABLE_IPO
 
 .include <bsd.port.mk>