System Preferences->Mission Controland un-check the box labeled
Displays have separate SpacesThis is necessary to get X11 to work properly.
% sudo xcode-select --installto get the /usr/include directories to install in order to build software. You may also elect to open Xcode, then go to Xcode->Preferences, then to the Downloads tab to install OS X 10.9 doc set and Xcode 5 doc set.
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