the packagers apparently screwed up royally, if you can dig up the actual tremulous binary (it's usually hidden behind a few layers of shell scripts in distro packages), and replace it with this then it should work.
Hi

I've tryed and in Fedora 11 tremulous binary is in /usb/bin/ and pk3 files are in /usr/share/tremulous/base/
Now if I run your client I get this:
[tdfs@Movy ~]$ tremulous
tremulous 1.1.0_SVN1117M linux-x86_64 Dec 14 2008
----- FS_Startup -----
----------------------
0 files in pk3 files
Couldn't load default.cfg
Do you know how to solve it?
Thanks a lot for your help guys!