I just learned that this issue can be worked around by passing the switch --HEAD to brew.
brew install macvim --HEAD --override-system-vim And macvim builds correctly on my machine with brew. Maybe this tip will help others who have difficulty building macvim or want the latest/greatest. -- You received this message from the "vim_mac" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php