после обновления появились

[root@s24 cron.daily]# ./freshclam
LibClamAV Warning: Cannot dlopen libclamunrar_iface: file not found - unrar support unavailable

ставим

[root@s24 cron.daily]# yum install clamav-devel
Loaded plugins: fastestmirror, presto
Loading mirror speeds from cached hostfile
epel/metalink                                                                                                   |  24 kB     00:00
 * base: centos-mirror.rbc.ru
 * epel: mirror.logol.ru
 * extras: centos-mirror.rbc.ru
 * rpmforge: mirror.awanti.com
 * updates: centos-mirror.rbc.ru
CentALT                                                                                                         |  951 B     00:00
base                                                                                                            | 3.7 kB     00:00
endpoint                                                                                                        |  951 B     00:00
extras                                                                                                          | 3.4 kB     00:00
rpmforge                                                                                                        | 1.9 kB     00:00
updates                                                                                                         | 3.4 kB     00:00
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package clamav-devel.x86_64 0:0.98.1-1.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=======================================================================================================================================
 Package                           Arch                        Version                              Repository                    Size
=======================================================================================================================================
Installing:
 clamav-devel                      x86_64                      0.98.1-1.el6                         CentALT                       46 k

Transaction Summary
=======================================================================================================================================
Install       1 Package(s)

Total download size: 46 k
Installed size: 76 k
Is this ok [y/N]: y
Downloading Packages:
Setting up and reading Presto delta metadata
Processing delta metadata
Package(s) data still to download: 46 k
clamav-devel-0.98.1-1.el6.x86_64.rpm                                                                            |  46 kB     00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : clamav-devel-0.98.1-1.el6.x86_64                                                                                    1/1
  Verifying  : clamav-devel-0.98.1-1.el6.x86_64                                                                                    1/1

Installed:
  clamav-devel.x86_64 0:0.98.1-1.el6

Complete!
[root@s24 cron.daily]# ./freshclam
[root@s24 cron.daily]#

ошибка ушла.
так же проверяем пути базы и права на файлы.

не забывая поправить файл /etc/logrotate.d/clamav