Index: head/devel/volk/Makefile
===================================================================
--- head/devel/volk/Makefile	(revision 530549)
+++ head/devel/volk/Makefile	(revision 530550)
@@ -1,23 +1,23 @@
 # $FreeBSD$
 
 PORTNAME=	volk
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.2.1
 CATEGORIES=	devel comms hamradio
 
 MAINTAINER=	hamradio@FreeBSD.org
 COMMENT=	VOLK is the Vector-Optimized Library of Kernels
 
 LICENSE=	GPLv3
 
 LIB_DEPENDS=	liborc-0.4.so:devel/orc
 BUILD_DEPENDS=	${PYTHON_SITELIBDIR}/mako/__init__.py:textproc/py-mako@${PY_FLAVOR}
 
-USES=		cmake python:3.5+
+USES=		cmake compiler:c++11-lang python:3.5+
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	gnuradio
 
 USE_LDCONFIG=	yes
 
 .include <bsd.port.mk>