[CentOS] yum update troubles

>> Running yum update on CentOS 4.8 32 bit I keep getting this:
>>
>> --> Running transaction check
>> --> Processing Dependency: perl(Compress::Raw::Zlib) = 2.024 for
>> package: perl-IO-Compress
>> --> Finished Dependency Resolution
>> Error: Missing Dependency: perl(Compress::Raw::Zlib) = 2.024 is needed
>> by package perl-IO-Compress
>>
>> I try to uninstall perl-IO-Compress but something like 91 packages
>> depend on it.  Any ideas?
>
> Do you have 3rd party repositories enabled? Did you enable them with
> care and use yum-plugin-priorities or yum-plugin-protectbase?
>
> You may have to untangle installed packages from mixed repositories
> before you can go any further.

Thats likely it.  Have rpmforge-release-0.5.1-1.el4.rf installed.