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XQuartz is an open-source version of X.Org X Window System that runs on macOS, it is required to run certain cross-platform applications on macOS. XQuartx was included with Mac OSX 10.5 (Leopard) to Mac OSX 10.7 (Lion), for all subsequent releases XQuartz is not included and must be downloaded separately.

Installing XQuartz

1.Download the latest version of XQuartz from

2.Navigate to the downloads folder and open the XQuartz Disk Image (XQuartz-2.7.11.dmg)
Download XQuartz.png 3.Open the the XQuartz package (XQuartz.pkg)
XQuartz Package.png 4.Follow the installation steps, accepting the licence agreement and choose an installation destination.
XQuartz Install.png 5.Once installation is complete logout and log in.
XQuartz Complete.png 6.Open the Terminal App

7.Login to Viper ssh -Y <username>

[username@login01 ~]$ ssh -Y <username>
Icon exclam1.png Note: -Y is used to enable the X window system..

Test XQuartz

To test X11 support type xclock, an analogue clock should appear.

[username@login01 ~]$ xclock


Further Information

Licence: Apple Public Source Licence and MIT
Apple Support - X11