Index: head/devel/protobuf/Makefile
===================================================================
--- head/devel/protobuf/Makefile	(revision 472178)
+++ head/devel/protobuf/Makefile	(revision 472179)
@@ -1,36 +1,39 @@
 # Created by: vanilla
 # $FreeBSD$
 
 PORTNAME=	protobuf
 PORTVERSION=	3.5.2
 DISTVERSIONPREFIX=	v
 CATEGORIES=	devel
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Data interchange format library
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BROKEN_sparc64=	fails to compile: no atomic ops available
 
 TEST_DEPENDS=	googlemock>=0:devel/googlemock \
 		googletest>=0:devel/googletest
 
 CFLAGS+=	-DGOOGLE_PROTOBUF_NO_RTTI -I${WRKSRC}/src
-CONFIGURE_ENV=	CXX_FOR_BUILD=c++
+CONFIGURE_ENV=	CC_FOR_BUILD="${CC}" CFLAGS_FOR_BUILD="${CFLAGS}" \
+		CPPFLAGS_FOR_BUILD="${CPPFLAGS}" \
+		CXX_FOR_BUILD="${CXX}" CXXFLAGS_FOR_BUILD="${CXXFLAGS}" \
+		LDFLAGS_FOR_BUILD="${LDFLAGS}"
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 TEST_ARGS=	${MAKE_ARGS} ${_MAKE_JOBS}
 TEST_TARGET=	check
 USE_LDCONFIG=	yes
 USES=		autoreconf compiler:c++11-lang gmake libtool localbase pathfix pkgconfig
 
 GH_ACCOUNT=	google
 USE_GITHUB=	yes
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|^check-local:|disabled-&|' ${WRKSRC}/Makefile.am
 	@${REINPLACE_CMD} -Ee '/gtest|mock/ s|[^ ]*lib(.*)\.la|-l\1|' ${WRKSRC}/src/Makefile.am
 
 .include <bsd.port.mk>