X11 and XQuartz

This is probably old news for many of you, but a recent thread on the scitech apple mailing list pointed to a very useful site for those of you using X11 on Leopard: the XQuartz project. From the web site: "The Xquartz project is an open-source effort to develop a version of the X Window System for Mac OS X. Together with supporting libraries and applications, it forms the X11.app that Apple has shipped with OS X since version 10.5."

In other words, you get for free and with code the latest version of Apple's own X11. The latest version is 2.1.1 and was released just a month ago, and fixes a lot of bugs that were in version 2.0 in Leopard.

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Fixed problems I was having with Matlab

I figured out about this XQuartz project a while ago when Matlab kept crashing X11 and further attempts to start Matlab would not be able to access the GUI only the command-line Matlab interface (seen by looking in the console). I would recommend this to people experiencing strange X11 crashes.

XQuartz

Just to be on the safe side should the upgrade turn out to be problematic -- how can I re-install the version of X11.app that came with my OS X (10.5.2) install DVD? I've searched for the .pkg file, but couldn't locate it.

X11.app in Leopard DVD

The X11 is in the optional install package. There is also a good set of instructions about how to recover an X11 installation in this page:

http://homepage.mac.com/sao1/X11/index.html