Index: head/www/yarn/Makefile
===================================================================
--- head/www/yarn/Makefile	(revision 518039)
+++ head/www/yarn/Makefile	(revision 518040)
@@ -1,57 +1,59 @@
 # $FreeBSD$
 
 PORTNAME=	yarn
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.19.1
 CATEGORIES=	www
 MASTER_SITES=	https://yarnpkg.com/downloads/${PORTVERSION}/
 
 MAINTAINER=	pizzamig@FreeBSD.org
 COMMENT=	Package manager for node, alternative to npm
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-CONFLICTS_INSTALL?=	yarn-node10 yarn-node8
+CONFLICTS_INSTALL?=	yarn-node12 yarn-node10 yarn-node8
 
 OPTIONS_DEFINE=	HADOOPCOMPAT
 OPTIONS_SINGLE=	BACKEND
-OPTIONS_SINGLE_BACKEND=	NODE8 NODE10 NODE
+OPTIONS_SINGLE_BACKEND=	NODE8 NODE10 NODE12 NODE
 OPTIONS_DEFAULT=	NODE
 HADOOPCOMPAT_DESC=	hadoop2 compatibility, the yarn script is excluded
 NODE_DESC=	Use www/node as backend
+NODE12_DESC=	Use www/node12 as backend
 NODE10_DESC=	Use www/node10 as backend
 NODE8_DESC=	Use www/node8 as backend
 
 OPTIONS_SUB=	yes
 
 NODE_RUN_DEPENDS=	node>=0.8.0:www/node
+NODE12_RUN_DEPENDS=	node12>=12.0.0:www/node12
 NODE10_RUN_DEPENDS=	node10>=10.0.0:www/node10
 NODE8_RUN_DEPENDS=	node8>=0.8.0:www/node8
 
 HADOOPCOMPAT_CONFLICTS_INSTALL_OFF=	hadoop2*
 
 NO_ARCH=	yes
 NO_BUILD=	yes
 
 post-patch:
 	@${RM} ${WRKSRC}/bin/*.cmd
 	@${REINPLACE_CMD} -i '' \
 		-e 's|"installationMethod": "tar"|"installationMethod": "pkg"|g' \
 		${WRKSRC}/package.json
 	@${REINPLACE_CMD} -i '' -e 's%Linux)%Linux|FreeBSD)%g' \
 		${WRKSRC}/bin/yarn
 
 do-install:
 	${MKDIR} ${STAGEDIR}${PREFIX}/lib/node_modules/yarn
 	(cd ${WRKSRC}/ && ${COPYTREE_SHARE} . ${STAGEDIR}${PREFIX}/lib/node_modules/yarn)
 	${RLN} ${STAGEDIR}${PREFIX}/lib/node_modules/yarn/bin/yarn.js \
 		${STAGEDIR}${PREFIX}/bin/yarn.js
 	${RLN} ${STAGEDIR}${PREFIX}/lib/node_modules/yarn/bin/yarnpkg \
 		${STAGEDIR}${PREFIX}/bin/yarnpkg
 
 do-install-HADOOPCOMPAT-off:
 	${RLN} ${STAGEDIR}${PREFIX}/lib/node_modules/yarn/bin/yarn \
 		${STAGEDIR}${PREFIX}/bin/yarn
 
 .include <bsd.port.mk>
Index: head/www/yarn-node10/Makefile
===================================================================
--- head/www/yarn-node10/Makefile	(revision 518039)
+++ head/www/yarn-node10/Makefile	(revision 518040)
@@ -1,13 +1,13 @@
 # Created by: Luca Pizzamiglio <pizzamig@FreeBSD.org>
 # $FreeBSD$
 
 PKGNAMESUFFIX=	-node10
 
-CONFLICTS_INSTALL=	yarn yarn-node8
+CONFLICTS_INSTALL=	yarn yarn-node8 yarn-node12
 
-OPTIONS_EXCLUDE=	NODE NODE8 NODE6
+OPTIONS_EXCLUDE=	NODE NODE8 NODE12
 OPTIONS_SLAVE=	NODE10
 
 MASTERDIR=	${.CURDIR}/../yarn
 
 .include "${MASTERDIR}/Makefile"
Index: head/www/yarn-node8/Makefile
===================================================================
--- head/www/yarn-node8/Makefile	(revision 518039)
+++ head/www/yarn-node8/Makefile	(revision 518040)
@@ -1,13 +1,13 @@
 # Created by: Luca Pizzamiglio <pizzamig@FreeBSD.org>
 # $FreeBSD$
 
 PKGNAMESUFFIX=	-node8
 
-CONFLICTS_INSTALL=	yarn yarn-node10
+CONFLICTS_INSTALL=	yarn yarn-node10 yarn-node12
 
-OPTIONS_EXCLUDE=	NODE NODE10 NODE6
+OPTIONS_EXCLUDE=	NODE NODE10 NODE12
 OPTIONS_SLAVE=	NODE8
 
 MASTERDIR=	${.CURDIR}/../yarn
 
 .include "${MASTERDIR}/Makefile"