Index: head/net/libarcus/Makefile
===================================================================
--- head/net/libarcus/Makefile	(revision 530388)
+++ head/net/libarcus/Makefile	(revision 530389)
@@ -1,23 +1,23 @@
 # $FreeBSD$
 
 PORTNAME=	libArcus
 PORTVERSION=	15.06.03
 CATEGORIES=	net cad
 DIST_SUBDIR=	Ultimaker
 
 MAINTAINER=	db@FreeBSD.org
 COMMENT=	Communication library between internal components for Ultimaker
 
 LICENSE=	LGPL3
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	sip:devel/py-sip@${PY_FLAVOR}
 LIB_DEPENDS=	libprotobuf.so:devel/protobuf
 
-USES=		cmake python:3.4+
+USES=		cmake compiler:c++11-lang python:3.4+
 USE_GITHUB=	yes
 GH_ACCOUNT=	Ultimaker
 USE_LDCONFIG=	yes
 GH_TAGNAME=	d0f1ac1
 
 .include <bsd.port.mk>