diff --git a/devel/rubygem-posix-spawn/Makefile b/devel/rubygem-posix-spawn/Makefile
index 77e7b5b7a7d1..c271dfe200b8 100644
--- a/devel/rubygem-posix-spawn/Makefile
+++ b/devel/rubygem-posix-spawn/Makefile
@@ -1,17 +1,23 @@
 PORTNAME=	posix-spawn
 PORTVERSION=	0.3.15
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 
 MAINTAINER=	ruby@FreeBSD.org
 COMMENT=	Ruby wrapper for posix_spawnp(2) for faster process spawning
 WWW=		https://github.com/rtomayko/posix-spawn
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		gem
 
 PLIST_FILES=	bin/posix-spawn-benchmark
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CONFIGURE_ARGS+=	--with-cflags="-Wno-error=incompatible-function-pointer-types"
+.endif
+
 .include <bsd.port.mk>