diff --git a/japanese/Wnn6-lib/Makefile b/japanese/Wnn6-lib/Makefile
index 5eb42e168d59..3f29d4b54865 100644
--- a/japanese/Wnn6-lib/Makefile
+++ b/japanese/Wnn6-lib/Makefile
@@ -1,35 +1,41 @@
 PORTNAME=	Wnn6-lib
 PORTVERSION=	2000.9.1
 PORTREVISION=	2
 CATEGORIES=	japanese
 MASTER_SITES=	ftp://ftp.omronsoft.co.jp/pub/Wnn6/sdk_source/
 DISTNAME=	Wnn6-SDK
 
 MAINTAINER=	hrs@FreeBSD.org
 COMMENT=	Wnn6 client library
 WWW=		https://www.omronsoft.co.jp/
 
 OPTIONS_DEFINE=	DOCS
 
 USES=		imake
 USE_LDCONFIG=	yes
 WRKSRC=		${WRKDIR}/src/contrib/im/Xsi
 PORTDOCS=	README
 
+.include <bsd.port.pre.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400079
+CFLAGS+=       -Wno-error=int-conversion
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e 's,/usr/X11R6,${LOCALBASE},g' \
 		${WRKSRC}/config/Project.tmpl \
 		${WRKSRC}/config/X11.tmpl \
 		${WRKSRC}/Makefile.ini
 
 do-build:
 	(cd ${WRKSRC} && ${SETENV} ${MAKE_ENV}  make World -f Makefile.ini)
 
 post-install:
 	${LN} -sf libwnn6_fromsrc.a ${STAGEDIR}${PREFIX}/lib/libwnn6.a
 	${MKDIR} ${STAGEDIR}${PREFIX}/include/wnn6/wnn
 	${INSTALL_DATA} ${WRKSRC}/Wnn/include/*.h ${STAGEDIR}${PREFIX}/include/wnn6/wnn
 	${MKDIR} ${STAGEDIR}${DOCSDIR}
 	(cd ${WRKSRC} && ${INSTALL_DATA} ${PORTDOCS} ${STAGEDIR}${DOCSDIR})
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>