Index: head/devel/xtoolchain-llvm40/Makefile
===================================================================
--- head/devel/xtoolchain-llvm40/Makefile	(revision 495362)
+++ head/devel/xtoolchain-llvm40/Makefile	(revision 495363)
@@ -1,7 +1,10 @@
 # $FreeBSD$
 
 LLVM_SUFFIX=40
 
+DEPRECATED=		No supported release uses this version
+EXPIRATION_DATE=	2019-03-31
+
 MASTERDIR=	${.CURDIR}/../xtoolchain-llvm-devel
 
 .include "${MASTERDIR}/Makefile"
Index: head/devel/xtoolchain-llvm50/Makefile
===================================================================
--- head/devel/xtoolchain-llvm50/Makefile	(revision 495362)
+++ head/devel/xtoolchain-llvm50/Makefile	(revision 495363)
@@ -1,7 +1,10 @@
 # $FreeBSD$
 
 LLVM_SUFFIX=50
 
+DEPRECATED=		No supported release uses this version
+EXPIRATION_DATE=	2019-03-31
+
 MASTERDIR=	${.CURDIR}/../xtoolchain-llvm-devel
 
 .include "${MASTERDIR}/Makefile"