diff --git a/shells/klish/Makefile b/shells/klish/Makefile
index 31adf3ba8363..9175376840f9 100644
--- a/shells/klish/Makefile
+++ b/shells/klish/Makefile
@@ -1,18 +1,26 @@
 PORTNAME=	klish
 PORTVERSION=	2.1.4
 CATEGORIES=	shells
 MASTER_SITES=	http://libcode.org/attachments/download/70/
 
 MAINTAINER=	umeno@rr.iij4u.or.jp
 COMMENT=	Kommand Line Interface Shell
 WWW=		http://libcode.org/projects/klish/
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENCE
 
 USES=		libtool tar:xz
-GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
+
+GNU_CONFIGURE=	yes
+
 INSTALL_TARGET=	install-strip
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=incompatible-function-pointer-types
+.endif
+
 .include <bsd.port.mk>