Why won't MyPaint Start on Mac?

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The problem

I just installed MyPaint via sudo port install mypaint, but it won’t start!

The last line MyPaint says when run in the terminal is:

AttributeError: 'NoneType' object has no attribute 'append_search_path'

The Answer

From this comment on GitHub:

In a default MacPorts installation, MyPaint uses X11. Therefore you must install an X11 server. MacPorts doesn’t do it automatically because it doesn’t know which one you want.

Steps to Take

Run sudo port install xorg-server in the command line.
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