Mac OS X 10.6 (Snow Leopard) has VIM pre-installed (version 7.2), which is great.
It also has Ruby pre-installed (version 1.8.7) which is great too.
However, I want Ruby autocompletion in VIM. Looking up the VIM version (vim --version) shows -ruby (i.e. ruby support isn't enabled).
How to enable ruby for my VIM installation?