As far as I can tell, clamav scans for /windoz/ virii, not linux virii (which are basically non-existant). Are you trying to scan for windoz virii or linux virii?
It looks like those GUI packages are not part of clamav, but are 3rd party programs. I think the reason something like knoppix includes so many is so people can boot off the CD to scan their windoz systems from linux.
There are a couple rootkit checking packages in BLAG that check for Linux rootkits: rkhunter & chkrootkit. If you are trying to verify that your BLAG system is clean, you may want to check those out.
To search other repos for 30k-compatible RPMs see:
can help you track things down (covers lots of distros).