[gentoo-alt] OS X prefix: vim has("mac") and has("macunix") return false?

[yegle]

I was trying to disable a vundle in OS X by adding the following snippet:

if !has("mac")
    Plugin XXXX
endif

But surprisingly it doesn't work. And with some test I found
has("mac") and has("macunix") both returned false in vim installed via
Prefix and the one comes with OS X.

$ $HOME/.gentoo/usr/bin/vim +'redir! > /dev/stdout' '+echo has("mac")
|| has("macunix")' +qall
0
$ /usr/bin/vim +'redir! > /dev/stdout' '+echo has("mac") ||
has("macunix")' +qall
0

But strangely, MacVim (https://github.com/macvim-dev/macvim) correctly
recognized this feature test:
$ /Applications/MacVim.app/Contents/MacOS/Vim +'redir! >/dev/stdout'
+'echo has("mac")' +qall
1

Is there a way to make the vim in prefix behave the same as MacVim?

Thank you!


-- 
yegle
http://about.me/yegle