Install X11 On Mac OSX
By default, X11 is not installed on Mac OSX. In order get most of X11 open source working, you got to configure X11 on your lovely Mac. Configuration X11 on Mac is pretty simple and straight forward.
Step 1: Insert your Mac Installation CD
Step 2: Browse the CD and select Optional Installs
Step 3: In the installation tree, select Application > X11
Step 4: Finish the step and installation begin.
To verify X11 is installed on your Mac, open up Application > Utilities, and you should see X11 inside.
Have fun with Mac