Gentoo's Bugzilla –
Attachment 458720 Details for
Bug 604650app-antivirus/clamav-0.99.2 : configure: error: The installed zlib version may contain a security bug. Please upgrade to 1.2.2 or later: http://www.zlib.net. You can omit this check with --disable-zlib-vcheck but DO NOT REPORT any stability issues then!