patch 8.0.1820: terminal window redirecting stdout does not show stderr commit https://github.com/vim/vim/commit/cd8fb449d6486a1a5a09c8c098ea3a38c19e8dc5 Author: Bram Moolenaar <Bram@vim.org> Date: Sat May 12 17:42:42 2018 +0200 patch 8.0.1820: terminal window redirecting stdout does not show stderr Problem: Terminal window redirecting stdout does not show stderr. (Mat?o Zanibelli) Solution: When stdout is not connected to pty_master_fd then use it for stderr. (closes #2903)

the first target to make vim is: reconfig
srcdir = .
VIMNAME = vim
EXNAME = ex
VIEWNAME = view