Using X11 in Mountain Lion July 29, 2012MattComment on Using X11 in Mountain Lion Mountain Lion no longer includes X11. You’ll have to use X-Quartz. MacOSXHints.com via Using X11 in Mountain Lion. Share this: Share on Facebook (Opens in new window) Facebook More Print (Opens in new window) Print Share on Reddit (Opens in new window) Reddit Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email Like this:Like Loading... Related