Index: head/lang/ccl/Makefile
===================================================================
--- head/lang/ccl/Makefile	(revision 548294)
+++ head/lang/ccl/Makefile	(revision 548295)
@@ -1,63 +1,67 @@
 # $FreeBSD$
 
 PORTNAME=	ccl
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.12
 CATEGORIES=	lang lisp
 MASTER_SITES+=	https://github.com/${GH_ACCOUNT}/${GH_PROJECT}/releases/download/v${PORTVERSION}/:bootstrap
 DISTFILES=	freebsdx86.tar.gz:bootstrap
 DIST_SUBDIR=	${PORTNAME}/${DISTVERSIONPREFIX}${PORTVERSION}
 EXTRACT_ONLY=	${DISTNAME}${EXTRACT_SUFX}
 
 MAINTAINER=	olgeni@FreeBSD.org
 COMMENT=	Clozure CL is a free Common Lisp implementation
 
 LICENSE=	LGPL21
 
 ONLY_FOR_ARCHS=	amd64
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	Clozure
 
 CCL_DIRECTORY=	${PREFIX}/lib/ccl
 # the following files will not be installed
 EXCLUDE=	cocoa-ide lisp-kernel scripts fx86cl fx86cl.image
 
 USE_ASDF=	yes
 
 .include "${.CURDIR}/../../devel/cl-asdf/bsd.cl-asdf.mk"
 
 .include <bsd.port.pre.mk>
 
+.if ${OSVERSION} < 1200000
+IGNORE=         does not build on FreeBSD < 12.0
+.endif
+
 LISP_ARCH=	x8664
 FX86CL=		fx86cl64
 
 SUB_LIST+=	CCL_DIRECTORY="${CCL_DIRECTORY}" \
 		FX86CL="${FX86CL}"
 SUB_FILES=	ccl.sh
 
 post-extract:
 	@cd ${WRKSRC} && ${EXTRACT_CMD} ${EXTRACT_BEFORE_ARGS} ${_DISTDIR}/freebsdx86.tar.gz
 
 post-patch:
 	@${SED}	-i '' -e 's|%%LOCALBASE%%|${LOCALBASE}|' ${WRKSRC}/tools/asdf.lisp
 	@${SED}	-i '' -e 's|%%TAG%%|v${PORTVERSION}|' ${WRKSRC}/lisp-kernel/freebsdx86*/Makefile
 	@${FIND} ${WRKSRC} -name .svn -or -name .cvsignore -or -name "*.orig" \
 		| ${XARGS} ${RM} -r
 
 do-build:
 	@${RM} ${WRKSRC}/fx86cl ${WRKSRC}/fx86cl64
 	@cd ${WRKSRC}/lisp-kernel/freebsd${LISP_ARCH} && ${MAKE} && ${RM} *.o
 	@cd ${WRKSRC} && ${ECHO_CMD} | ${SETENV} -u CCL_DEFAULT_DIRECTORY ./${FX86CL} --no-init --batch --quiet \
 		--eval "(ccl:rebuild-ccl :full t)" \
 		--eval "(quit)"
 
 do-install:
 	@${MKDIR} ${STAGEDIR}${PREFIX}/lib/ccl
 	${CP} -r ${WRKSRC}/* ${STAGEDIR}${CCL_DIRECTORY}
 	@for i in ${EXCLUDE}; do \
 		${RM} -r ${STAGEDIR}${CCL_DIRECTORY}/$${i}; \
 	done
 	${INSTALL_SCRIPT} ${WRKDIR}/ccl.sh ${STAGEDIR}${PREFIX}/bin/ccl
 
 .include <bsd.port.post.mk>