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
@@ -14,4 +14,10 @@ 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>