Index: Makefile
===================================================================
--- Makefile	(revision 491546)
+++ Makefile	(working copy)
@@ -20,7 +20,7 @@
 GH_ACCOUNT=	${GH_PROJECT}
 GH_PROJECT=	OpenCPN
 
-USES=		cmake compiler:c++11-lib gettext-tools localbase
+USES=		cmake compiler:c++11-lib gettext-tools gl gnome localbase
 USE_CXXSTD=	c++11
 USE_GL=		gl
 USE_GNOME=	cairo gdkpixbuf2 gtk20
@@ -41,5 +41,9 @@
 		${WRKSRC}/src/mygdal/cpl_csv.cpp \
 		${WRKSRC}/src/mygdal/cpl_findfile.cpp \
 		${WRKSRC}/data/doc/help_en_US.html
+.if exists(/usr/lib/libstdc++.so)
+	@${REINPLACE_CMD} -e '/-msse/d' -e '/-mssse3/d' \
+		-e '/-mavx2/d' ${WRKSRC}/CMakeLists.txt
+.endif	
 
 .include <bsd.port.mk>