I'm running bspwm on OS X. This is some advice:

Install XQuartz (http://xquartz.macosforge.org/landing/)
I recommend installing pkgin from saveosx.org (http://saveosx.org/pkgin-howto/).
It makes it easy to install many wm's. Full list here: http://pkgsrc.saveosx.org/Darwin/2013Q3/x86_64/wm/

Alternatively you could install one from source, though you may need to edit the makefile for it build properly.

Then you need to setup the ~/.xinitrc. This works the same as it does on linux.
You can use /Applications/Utilities/Console.app to find out why XQuartz won't start.

You can find my xinitrc on github at: https://github.com/stayradiated/dotfiles...WM/xinitrc