yum -y install mod_perl
Gathering header information file(s) from server(s)
Server: Centos-3 - i386/i686 - Addons
Server: Centos-3 - i386/i686 - Base
Server: Centos-3 - i386/i686 - Extras
Server: Centos-3 - i386/i686 - Updates
Finding updated packages
Downloading needed headers
Resolving dependencies
....Unable to satisfy dependencies
Package mod_perl needs httpd >= 2.0.40, this is not available.
Package mod_perl needs httpd-mmn = 20020903, this is not available.