Index: head/lang/gcc6-aux/Makefile.common
===================================================================
--- head/lang/gcc6-aux/Makefile.common	(revision 408640)
+++ head/lang/gcc6-aux/Makefile.common	(revision 408641)
@@ -1,14 +1,15 @@
 # $FreeBSD$
 
 .include "Makefile.version"
 
 LIB_DEPENDS=		libgmp.so:${PORTSDIR}/math/gmp
 LIB_DEPENDS+=		libmpfr.so:${PORTSDIR}/math/mpfr
 LIB_DEPENDS+=		libmpc.so:${PORTSDIR}/math/mpc
 
 ONLY_FOR_ARCHS= 	i386 amd64
 
 GNU_CONFIGURE=		yes
 USES=			gmake libtool perl5 tar:bzip2
 USE_PERL5=		build
 ALL_TARGET=		default
+CFLAGS:=		${CFLAGS:N-march=*}