russian/xruskb: Fix build with llvm16

- Pet portclippy

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

russian/xruskb/Makefile

@@ -13,9 +13,10 @@ LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		tar:bzip2 xorg
+USE_XORG=	x11 ice xt xmu xext sm
+
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--datadir=${PREFIX}/share
-USE_XORG=	x11 ice xt xmu xext sm
 
 PORTDOCS=	*
 PORTDATA=	*
@@ -26,6 +27,12 @@ MOTIF_USES=	motif
 MOTIF_CONFIGURE_ON=	--with-toolkit=motif
 MOTIF_CONFIGURE_OFF=	--with-toolkit=none
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CFLAGS+=	-Wno-error=incompatible-function-pointer-types
+.endif
+
 post-install:
 	${INSTALL_DATA} ${WRKSRC}/Xrus.ad ${STAGEDIR}${PREFIX}/lib/X11/app-defaults/Xrus