brew edit vim

gistfile1.txt

...

option "override-system-vi", "Override system vi"
option "disable-nls", "Build vim without National Language Support (translated messages, keymaps)"
option "with-client-server", "Enable client/server mode"
option "revert-fold-patch", "Reverts path 7.4.700, which break folding"

...

if build.with? "revert-fold-patch"
 patch do
   url "https://gist.githubusercontent.com/knubie/ed71342c4504daba4f674d2f80a9c8b8/raw/42b4b1a9451f71dff7680364fb3586497cc2a6ee/vim-fold.patch"
   sha256 "609c04c0fd9365c636de2a7183343a99d152fbaaceb399f2de6176c80c59aed3"
 end
end