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Install XQuartz (http://xquartz.macosforge.org) which is the development version of the X11.app that ships with OS X, which means it is way more up to date. I have had some weird issues with X11.app v. 2.3-something. XQuartz 2.5.0 fixed that. 
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Install dwmfrom Homebrew,brew install dwm. This makes a bunch of necessary tweaks to the DWM configuration.
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Add the following script to $PATH, name it dwm-launchandchmod 755:cd ~
while true