From Wine-Doors site

Quake Wars To try and keep ahead of the game I’ve built a package for Enemy Territory Quake Wars.

If you’re a Linux user you’ll get it here first.

There’s only one dll over-ride required and one minor patch to get Quake Wars working, however this won’t be in the slightest bit comparable to the Native Client which will hopefully be available soon and make this effort completely redundant.

The package is available now in wine-doors 0.1.1 if you can’t see it your cache is too recent, clear it out with rm -rf ~/.wine-doors/packlists/*