mail/xpbiff: Fix build with llvm15

- Pet portclippy

Approved by:	portmgr (blanket)

mail/xpbiff/Makefile

@@ -12,9 +12,11 @@ COMMENT?=	Replacement for xbiff that handles popup window with mail header
 
 USES=		imake:noman xorg
 USE_XORG=	xpm xaw xmu
-PLIST_FILES=	bin/xpbiff
+
 WRKSRC=		${WRKDIR}/xpbiff
 
+PLIST_FILES=	bin/xpbiff
+
 .if defined(PREFIX) && ${PREFIX} != ${LOCALBASE}
 YOUBINBINDIR=	${PREFIX}
 .else
@@ -23,6 +25,10 @@ YOUBINBINDIR=	${LOCALBASE}
 
 .include <bsd.port.pre.mk>
 
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=int-conversion
+.endif
+
 do-extract:
 	@${RM} -r ${WRKDIR}
 	@${MKDIR} ${WRKDIR}