commit https://github.com/vim/vim/commit/4d585022023b96f6507e8cae5ed8fc8d926f5140 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Apr 14 19:50:22 2016 +0200 patch 7.4.1740 Problem: syn-cchar defined with matchadd() does not appear if there are no other syntax definitions which matches buffer text. Solution: Check for startcol. (Ozaki Kiichi, haya14busa, closes https://github.com/vim/vim/issues/757)

the first targets to make vim are: scratch config myself
srcdir = .
VIMNAME = vim
EXNAME = ex
VIEWNAME = view