Index: head/irc/netwalker-ircc/Makefile
===================================================================
--- head/irc/netwalker-ircc/Makefile	(revision 462483)
+++ head/irc/netwalker-ircc/Makefile	(revision 462484)
@@ -1,35 +1,42 @@
 # Created by: Emanuel Haupt <ehaupt@critical.ch>
 # $FreeBSD$
 
 PORTNAME=	netwalker-ircc
 PORTVERSION=	0.5.0
 CATEGORIES=	irc
 MASTER_SITES=	LOCAL/ehaupt
 
 MAINTAINER=	ehaupt@FreeBSD.org
 COMMENT=	Lightweight curses-based IRC client
 
 LICENSE=	GPLv2
 
 USES=		ncurses tar:tgz
 
 LDFLAGS+=	-lncurses -lpthread
 
+.include <bsd.port.pre.mk>
+
+# does not compile with clang 6.0.0
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1200056
+USE_GCC=	yes
+.endif
+
 post-patch:
 	@${SED} -e "s|%%PREFIX%%|${PREFIX}|g" \
 	${WRKSRC}/config.h > ${WRKSRC}/config.h.freebsd
 	${MV} ${WRKSRC}/config.h.freebsd ${WRKSRC}/config.h
 
 do-build:
 .for file in main functions screen server user messages signals parameter userdb
 	${CXX} ${CFLAGS} -c ${WRKSRC}/${file}.cc -o ${WRKSRC}/${file}.o
 .endfor
 	${CXX} ${LDFLAGS} -L${WRKSRC}/ ${WRKSRC}/*.o -o ${WRKSRC}/netwalker
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/netwalker ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_MAN} ${WRKSRC}/netwalker.1 ${STAGEDIR}${MANPREFIX}/man/man1
 	@${MKDIR} ${STAGEDIR}${DATADIR}
 	${INSTALL_DATA} ${WRKSRC}/help/* ${STAGEDIR}${PREFIX}/share/netwalker-ircc
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>