Run X11 in Mac OS X with XQuartzAdvanced Mac users may have noticed that X11 is no longer bundled with OS X, and it’s also no longer available as a separate installation option through Developer Tools. Instead, to run X11 on OS X Mountain Lion (and later), you’ll want to download and install the free XQuartz system, which bundles all the necessary libraries and apps together that are needed to run a full X11 Windowing System per
