Kolab 2.3.4 Problem with clamav

[Kabo]

HI,

I have a problem with kolab 2.3.4. After a fresh installation on SLES 10 
clamav don´t work.
In freshclam.log I found this message "[LibClamAV] *** This Version of 
the ClamAV engine is outdated. ***".

So I wanted upgrade clamav to Version 0.97.4.

After "/kolab/bin/openpkg rpmbuild -bb ./clamav.spec" an error occured.

"error: Failed build dependencies "
"openpkg >= 20100101 is needed by clamav-0.97.4-20120320 "

What can i do? Can help me anyone ?

Greetings

Kai