Index: head/lang/gprolog/Makefile
===================================================================
--- head/lang/gprolog/Makefile	(revision 448265)
+++ head/lang/gprolog/Makefile	(revision 448266)
@@ -1,61 +1,61 @@
 # Created by: Douglas Anestad <yotta@dougdidit.com>
 # $FreeBSD$
 
 PORTNAME=	gprolog
 PORTVERSION=	1.4.4
 PORTREVISION=	4
 CATEGORIES=	lang
 MASTER_SITES=	http://www.gprolog.org/
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Free Prolog compiler
 
 LICENSE=	GPLv2
 
 ONLY_FOR_ARCHS=	i386 amd64
 
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}/src
 
 USES=		gmake
 USE_GCC=	any
 USE_AUTOTOOLS=	autoconf
 PORTDOCS=	*
 PORTEXAMPLES=	*
 CFLAGS+=	-O3 # gcc5/gcc6 + -O2 = pl2wam hangs
 PLIST_SUB=	GPROLOG_VER=${PORTVERSION}
 CONFIGURE_ARGS=	--with-c-flags="${CFLAGS}" \
 		--with-doc-dir="${DOCSDIR}" \
 		--with-examples-dir="${EXAMPLESDIR}"
 CONFIGURE_TARGET=	${ARCH:S/amd64/x86_64/}-portbld-${OPSYS:tl}${OSREL}
 MAKE_JOBS_UNSAFE=	yes
 
 OPTIONS_DEFINE=		FD DOCS EXAMPLES
 OPTIONS_DEFAULT=	FD
 OPTIONS_SUB=		yes
 
 FD_DESC=		Enable finite domain constraint solver
 FD_CONFIGURE_OFF=	--disable-fd-solver
 
 # Disable registers on i386. This fixes build with gcc6.
 # See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852008
 .include <bsd.port.pre.mk>
 .if ${ARCH} == i386
-CONFIGURE_ARGS=		--disable-regs
+CONFIGURE_ARGS+=		--disable-regs
 .endif
 
 post-configure:
 	${REINPLACE_CMD} \
 		-E 's|^(INSTALL_PROGRAM *= *install +-s +-m) 555|\1 755|g' \
 		${WRKSRC}/Makefile
 	${REINPLACE_CMD} -E 's|^(INSTALL_DATA *= *install +-m) 444|\1 644|g' \
 		${WRKSRC}/Makefile
 	${REINPLACE_CMD} 's|$$(LN_S) $$(INSTALL_DIR)/bin|$$(LN_S) ../${PORTNAME}-${PORTVERSION}/bin|g' \
 		${WRKSRC}/Makefile
 
 post-install-EXAMPLES-off:
 	${RM} -r ${STAGEDIR}${EXAMPLESDIR}
 
 post-install-DOCS-off:
 	${RM} -r ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.post.mk>