has updated Xquartz, a version of the X.org X Window System that is able to run on Mac OS X. Together with supporting libraries and applications, it forms the X11.app that Apple has been shipping with installation discs ever since the release of Mac OS X 10.5 (Leopard). The new version (18.104.22.168) fixes a bug in the interaction between X11 and Spaces
As explained by Apple, Leopard's X11 package needs to be previously installed in order to apply this update. If you have uninstalled it or deselected it during your OS install, you will need to install it again from the installation DVD.
Released on 05.17.2009, X11 22.214.171.124 contains Xquartz-1.4.2-apple42. To install, download X11-126.96.36.199.dmg, and double-click the disk image to mount and begin installation. There are currently two situations where you need to re-install X11: 1- after future OS, and Security Updates delivered through Apple's Software Update; 2- after installing Xcode.
Besides the bug fix in the interaction between X11 and Spaces, the changelog also reveals that, “The software supporting the deprecated imake build system is not provided in this package. If you need imake and xmkmf, please install the X11 package that came with your Leopard DVD before installing this version.”
“Alternatively, you can compile these packages on your own or get them from a third party such as Fink or MacPorts. The darwin configuration files used by the imake build system are outdated and not supported. Developers using this build system are advised to migrate to autoconf,” a note on Mac OS forge ends.
Other “important notices” include the system requirements, which reveal that OS X 10.5.7 or later is required to install this package. Additional Mac OS X updates may also be required, so be sure you have your software up-to-date at all times. Download X11 (Free)