archivers/xpk: Fix build with llvm15

- Pet portclippy
- Adopt port

archivers/xpk/Makefile

@@ -5,7 +5,7 @@ CATEGORIES=	archivers
 MASTER_SITES=	http://vesuri.jormas.com/xpk/ \
 		http://www.energyhq.es.eu.org/files/
 
-MAINTAINER=	ports@FreeBSD.org
+MAINTAINER=	bofh@FreeBSD.org
 COMMENT=	The eXternal PacKer (XPK) library system
 WWW=		http://www.jormas.com/~vesuri/xpk/
 
@@ -13,10 +13,17 @@ LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		libtool
-GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 
+GNU_CONFIGURE=	yes
+
+.include <bsd.port.pre.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=int-conversion
+.endif
+
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libxpk*.so
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>