diff --git a/textproc/rubygem-fast_xs/Makefile b/textproc/rubygem-fast_xs/Makefile
index 80bbb316cac8..a782fdb65e87 100644
--- a/textproc/rubygem-fast_xs/Makefile
+++ b/textproc/rubygem-fast_xs/Makefile
@@ -1,16 +1,22 @@
 PORTNAME=	fast_xs
 PORTVERSION=	0.8.0
 PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	textproc rubygems
 MASTER_SITES=	RG
 
 MAINTAINER=	ruby@FreeBSD.org
 COMMENT=	Systems integration framework. Expander
 WWW=		http://fast-xs.rubyforge.org/
 
 LICENSE=	MIT
 
 USES=		gem
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
+CONFIGURE_ARGS+=	--with-cflags="-Wno-error=incompatible-function-pointer-types"
+.endif
+
 .include <bsd.port.mk>