diff --git a/irc/darkbot/Makefile b/irc/darkbot/Makefile
index 084e376304a2..21bf8d6e4502 100644
--- a/irc/darkbot/Makefile
+++ b/irc/darkbot/Makefile
@@ -24,7 +24,13 @@ MANCOMPRESSED=	yes
 GNU_CONFIGURE=	yes
 IS_INTERACTIVE=	yes
 
+.include <bsd.port.pre.mk>
+
+.if ${OSVERSION} >= 501000
+BROKEN=		"Does not compile"
+.endif
+
 pre-install:
 	${CAT} ${MASTERDIR}/pkg-plist | ${SED} -e "s,/usr/local,${LOCALBASE},g" > ${PLIST}
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>