Apple has removed X11 from the Mountain Lion distribution.
If you were running Wireshark on Lion and upgraded to Mountain Lion, or installed Wireshark on a fresh copy of Mountain Lion, it will no longer run.
You can bring it back by following these steps:
- Uninstall Wireshark by trashing the Wireshark.app bundle from your ~/Applications folder.
- Download the XQuartz installer from http://xquartz.macosforge.org/landing/ and run it.
- Download the latest Wireshark version and install it. Some posts on Stack Overflow suggest only older versions would run under Mountain Lion, but I cannot confirm this.
- On first install, Wireshark might pop up a dialog asking “Where is X11?”. Browse to ~/Applications/Utilities and select the XQuartz.app bundle.
That’s it. You’re done. If this has helped you, I’d appreciate winning you as a new follower @ralf on Twitter.