On Mar 15, 2012, at 3:14 PM, Sergio wrote: > My server uses CPanel.
> Does the above info helps?
Nope, sorry. However, it does suggest that you should discuss this with your ISP (or with CPanel directly-- they've got a lookup on http://www.cpanel.net/support.html which will figure out who owns the license), and they presumably know which platform you are running-- probably a flavor of Linux.
It's likely that your platform is missing a relevant security update to libz or similar which ought to be fixed. Once it is, ClamAV 0.97.4 ought to build without the warning...