patch 8.2.1801: undo file not found when using ":args" or ":next" Commit: https://github.com/vim/vim/commit/55b419b871dd35f5b05dd2aed65f14461b493ba9 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Oct 4 19:56:39 2020 +0200 patch 8.2.1801: undo file not found when using ":args" or ":next" Problem: Undo file not found when using ":args" or ":next". Solution: Handle like editing another file. (closes https://github.com/vim/vim/issues/7072)

/^CFLAGS[[:blank:]]*=/s/$/ -Wall -Wextra -Wshadow -Werror/
/^PERL_CFLAGS[[:blank:]]*=/s/$/ -Wno-error=unused-function/