chinese/celvis: Fix build with llvm16

- Pet portclippy

Sponsored by:	The FreeBSD Foundation

chinese/celvis/Makefile

@@ -8,9 +8,17 @@ MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Vi/ex clone that speaks Chinese
 
 USES=		ncurses
-CFLAGS+=	-Wno-error=return-type
+
 MAKE_ARGS=	LIBS="${LDFLAGS} -lncurses"
 
+CFLAGS+=	-Wno-error=return-type
+
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CFLAGS+=	-Wno-error=incompatible-function-pointer-types
+.endif
+
 do-install:
 	@# install target in celvis Makefile is not too good -- this is easier
 	${INSTALL_PROGRAM} ${WRKSRC}/celvis ${WRKSRC}/virec ${STAGEDIR}${PREFIX}/bin