Index: head/devel/libsavitar/Makefile
===================================================================
--- head/devel/libsavitar/Makefile	(revision 529229)
+++ head/devel/libsavitar/Makefile	(revision 529230)
@@ -1,31 +1,31 @@
 # $FreeBSD$
 
 PORTNAME=	libSavitar
 DISTVERSION=	4.5.0
 CATEGORIES=	devel cad
 DIST_SUBDIR=	Ultimaker
 
 MAINTAINER=	db@FreeBSD.org
 COMMENT=	LibSavitar is a c++ implementation of 3mf loading/python bindings
 
 LICENSE=	LGPL3
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}sip>0:devel/py-sip@${PY_FLAVOR}
 
-USES=		cmake python:3.4+
+USES=		cmake compiler:c++11-lang python:3.4+
 USE_GITHUB=	yes
 GH_ACCOUNT=	Ultimaker
 USE_GITHUB=	yes
 GH_TAGNAME=	96eba0e
 USE_LDCONFIG=	yes
 
 # need this hack so as not to conflict with pugixml
 # XXX TODO rework port to use pugixml instead
 post-install:
 	${RM} ${STAGEDIR}${PREFIX}/include/pugiconfig.hpp
 	${RM} ${STAGEDIR}${PREFIX}/include/pugixml.hpp
 	${RM} ${STAGEDIR}${PREFIX}/lib/cmake/pugixml/pugixml-config.cmake
 	${RM} ${STAGEDIR}${PREFIX}/lib/libpugixml.a
 
 .include <bsd.port.mk>