X11 forwarding on OS X (macOS)

X forwarding of Unix/Linux applications to OS X can be quite frustrating or easy depending on what steps are followed.  Here is a straight forward guide to the process:

1. Download the XQuartz X-Windows manager for OS X (macOS).
   Originally included  in OS X releases 10.5 through 10.7 the latest (and recommended) version is now available via the project website at:  https://www.xquartz.org/
    
2. Install XQuartz
   1. Mount the downloaded Disk Image (XQuartz-2.7.11.dmg at time of writing)
   2. Run the XQuartz installer
   3. Logout and back in to make XQuartz the default X11 server.
       
3. SSH to the remote host including the -X or -Y option.
   The -X enables X-forwarding. Sometimes, you might need to use -Y instead. This enables trusted X-forwarding.
    
4. Launch the application within the SSH session.In the example image below I have a SSH session to a RedHat host with KVM running and launched the VM Manager from the SSH session.