Index: head/mail/mailsync/Makefile
===================================================================
--- head/mail/mailsync/Makefile	(revision 554903)
+++ head/mail/mailsync/Makefile	(revision 554904)
@@ -1,44 +1,54 @@
 # Created by: Maxim Tulyuk <mt@primats.org.ua>
 # $FreeBSD$
 
 PORTNAME=	mailsync
 PORTVERSION=	5.2.1
 PORTREVISION=	4
 CATEGORIES=	mail
 MASTER_SITES=	SF
 DISTNAME=	${PORTNAME}_${PORTVERSION}.orig
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Keeps collection of mailboxes synchronized
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libc-client4.so:mail/cclient
 
 USES=		autoreconf gmake ssl
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-c-client=${LOCALBASE} \
 		--with-openssl=${OPENSSLBASE}
 
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}
 
 OPTIONS_DEFINE=	DOCS EXAMPLES
 
+.include <bsd.port.pre.mk>
+# This is a nasty hack due to the weird things that mail/cclient
+# do redefining C++ keywords. For some reason GCC seems to build
+# this, but we should expect it to break at some point.
+# See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250740
+# for reference.
+.if ${OPSYS} == FreeBSD && (${OSREL} == 12.2 || ${OSREL} == 11.4)
+USE_GCC=	yes
+.endif
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/src/mailsync ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_MAN} ${WRKSRC}/doc/mailsync.1 ${STAGEDIR}${MANPREFIX}/man/man1
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	cd ${WRKSRC} && ${INSTALL_DATA} AUTHORS NEWS README \
 		THANKS TODO ${STAGEDIR}${DOCSDIR}
 	cd ${WRKSRC}/doc && ${INSTALL_DATA} ABSTRACT HACKING \
 		mail_open_close_flowchart.dia \
 		mail_open_close_flowchart.svg \
 		mail_open_close_flowchart2.svg ${STAGEDIR}${DOCSDIR}
 
 do-install-EXAMPLES-on:
 	@${MKDIR} ${STAGEDIR}${EXAMPLESDIR}
 	${INSTALL_DATA} ${WRKSRC}/doc/examples/mailsync ${STAGEDIR}${EXAMPLESDIR}
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>