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Because of this, you may experience conflicts after doing a Software Update from Apple. Since the XQuartz X11 package clobbers Apple's X11.app, their software update will clobber the XQuartz X11 package. OS X Software Updates have included some of the work done by the XQuartz project, but for various reasons, Apple cannot ship the latest and greatest version offered by the XQuartz site.
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Together with supporting libraries and applications, it forms the X11.app that Apple shipped with OS X versions 10.5 through 10.7. The XQuartz project is an open-source effort to develop a version of the X.Org X Window System that runs on macOS.
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