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Before switcthing to Mac OSX 10.8 everytime I launch application which uses x11 it was starting x11 automatically.

After switching to XQuartz and 10.8 it does not work anymore and I have to launch XQuartz manually.

How to launch XQuartz on demand?

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Do you set DISPLAY in .bashrc/.profile/.bash_profile or the like? Check it by starting Terminal.app and typing echo $DISPLAY. –  jaume May 15 '13 at 10:28
    
No, I don't set it. –  Ask May 17 '13 at 11:30

2 Answers 2

up vote 3 down vote accepted

I was having the same problem. Quitting XQuartz and deleting ~/.Xauthority resolved the issue for me. I got the idea to do this from the Mountain Lion, Xquartz, and (lost) autostart thread in the Apple Mailing List. Other suggestions from that thread include:

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I don't have to launch xQuartz, I just use Terminal and ssh -Y user@IP. Then X emulation appears to be available as I can launch X windows from the server.

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