First, Thanks for a great Tutorial Falko.
I too am running in to the same problem with clamd. The first time I installed it as 'su', then reading your post , completely logged out and logged back in directly as root with the same result. I attempted to install using yum as well as downloading the rpm and installing it that way. Do you think compiling locally might work?
The error that yum gave during the first attempt is
Non-fatal POSTIN scriptlet failure in rpm package clamd-0.97.3-2.el6.i686
error reading information on service clamd: No such file or directory
warning: %post(clamd-0.97.3-2.el6.i686) scriptlet failed, exit status 1
There were also problems trying to remove it once installed (summary)
[root@web phpMyAdmin]# yum remove clamd
--> Processing Dependency: /usr/sbin/clamd for package: amavisd-new-2.6.4-2.el6.noarch
--> Processing Dependency: /etc/clamd.d for package: amavisd-new-2.6.4-2.el6.noarch
---> Package amavisd-new.noarch 0:2.6.4-2.el6 will be erased
Erasing : amavisd-new-2.6.4-2.el6.noarch 1/2
Shutting down amavisd: [FAILED]
Stopping clamd.amavisd: [FAILED]
Error in PREUN scriptlet in rpm package clamd
clamd-0.97.3-2.el6.i686 was supposed to be removed but is not!