Update runtime files.
diff --git a/runtime/syntax/make.vim b/runtime/syntax/make.vim
index 62a591a..0e057d2 100644
--- a/runtime/syntax/make.vim
+++ b/runtime/syntax/make.vim
@@ -1,9 +1,9 @@
" Vim syntax file
" Language: Makefile
-" Maintainer: Roland Hieber <rohieb+vim-iR0jGdkV@rohieb.name>
+" Maintainer: Roland Hieber <rohieb+vim-iR0jGdkV@rohieb.name>, <https://github.com/rohieb>
" Previous Maintainer: Claudio Fleiner <claudio@fleiner.com>
-" URL: https://github.com/vim/vim/syntax/make.vim
-" Last Change: 2019 Dec 04
+" URL: https://github.com/vim/vim/blob/master/runtime/syntax/make.vim
+" Last Change: 2020 Jan 15
" quit when a syntax file was already loaded
if exists("b:current_syntax")
@@ -42,6 +42,7 @@
syn match makeIdent "\$\$\w*"
syn match makeIdent "\$[^({]"
syn match makeIdent "^ *[^:#= \t]*\s*[:+?!*]="me=e-2
+syn match makeIdent "^ *[^:#= \t]*\s*::="me=e-3
syn match makeIdent "^ *[^:#= \t]*\s*="me=e-1
syn match makeIdent "%"