games/xpipeman: Fix build with llvm16

- Add LICENSE MIT

Approved by:	portmgr (blanket)
Sponsored by:	The FreeBSD Foundation

games/xpipeman/Makefile

@@ -1,16 +1,26 @@
 PORTNAME=	xpipeman
 PORTVERSION=	1.5
+PORTREVISION=	1
 CATEGORIES=	games
 MASTER_SITES=	SUNSITE/games/strategy
 DISTNAME=	${PORTNAME}
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Connect the pipes to stop the leaks
 
+LICENSE=	MIT
+
 USES=		imake tar:Z xorg
 USE_XORG=	x11 xaw xext xmu xt sm ice
+
 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_PROGRAM} ${WRKSRC}/xpipeman ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_MAN} ${WRKSRC}/xpipeman.man ${STAGEDIR}${MANPREFIX}/man/man6/xpipeman.6