Index: head/astro/gpsbabel/Makefile
===================================================================
--- head/astro/gpsbabel/Makefile	(revision 544741)
+++ head/astro/gpsbabel/Makefile	(revision 544742)
@@ -1,59 +1,62 @@
 # Created by: Laurent Courty
 # $FreeBSD$
 
 PORTNAME=	gpsbabel
 DISTVERSIONPREFIX=	${PORTNAME}_
 DISTVERSION=	1_6_0
 PORTREVISION=	1
 CATEGORIES=	astro geography
 
 MAINTAINER=	dev2@heesakkers.info
 COMMENT=	GPS file translating tool
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		compiler:c++11-lang gmake localbase qt:5
 USE_QT=		core qmake_build
 
 CONFLICTS=	gpsbabel14-[0-9]*
 
 USE_GITHUB=	yes
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-zlib=system
 
 OPTIONS_DEFINE=	GUI
 OPTIONS_SUB=	yes
 
 GUI_USES=	gl
 GUI_USE=	GL=gl \
 		QT=declarative,gui,location,network,printsupport,webchannel \
 		QT=webengine,widgets,xml,buildtools_build,linguisttools_build
 GUI_ALL_TARGET=	gui
 GUI_VARS=	MAKE_JOBS_UNSAFE=yes
 
+CONFIGURE_ENV=	CC="${CC}" CXX="${CXX}" CFLAGS="${CFLAGS}" CXXFLAGS="${CXXFLAGS}"
+MAKE_ENV=	CC="${CC}" CXX="${CXX}" CFLAGS="${CFLAGS}" CXXFLAGS="${CXXFLAGS}"
+
 do-build:
-	(cd ${WRKSRC}; ${CONFIGURE_CMD} --with-zlib-system; ${GMAKE})
+	(cd ${WRKSRC}; ${CONFIGURE_ENV} ${CONFIGURE_CMD} --with-zlib-system; ${MAKE_ENV} ${GMAKE})
 do-build-GUI-on:
 	(cd ${WRKSRC}/gui; ${QMAKE} USE_GUI=qt5; ${LRELEASE} *.ts; ${GMAKE})
 
 post-patch:
 	@${REINPLACE_CMD} '/langPath_ = / \
 		s|QApplication::applicationDirPath()|"${DATADIR}"|' \
 			${WRKSRC}/gui/mainwindow.cc
 	@${RM} -r ${WRKSRC}/zlib/contrib/minizip
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/gpsbabel ${STAGEDIR}${PREFIX}/bin/
 
 do-install-GUI-on:
 	${INSTALL_PROGRAM} ${WRKSRC}/gui/objects/gpsbabelfe \
 		${STAGEDIR}${PREFIX}/bin/
 	${INSTALL_DATA} ${WRKSRC}/gui/gpsbabel.desktop \
 		${STAGEDIR}${PREFIX}/share/applications/
 	${MKDIR} ${STAGEDIR}${DATADIR}/translations
 	${INSTALL_DATA} ${WRKSRC}/gui/*.qm ${STAGEDIR}${DATADIR}/translations/
 	${INSTALL_DATA} ${WRKSRC}/gui/images/appicon.png \
 		${STAGEDIR}${PREFIX}/share/pixmaps/gpsbabel.png
 
 .include <bsd.port.mk>