I have a squidguard rpm originally from the "green computer" site. I believe this RPM is built from Darrell May's. It works for 4.1.2. I use it on 5.0. I have not been able to get it to work on 5.1.2. I can email it to you if you want this version of squidguard.
Note: In 5.0, the web based tool for squidguard does not work from the server-manager link that gets installed. Instead, I use a browser and point it to the squidguard ibay. I also put a password on this ibay from server manager so it can be available from anywhere with password protection.
For my system, I use this address from my lan:
http://smename/squidguard/ or from the internet:
http://xxx.domain.com/squidguard/ I then use squidguard as the username and enter my password to access the ibay. Note that Ibay usernames are the same as the ibay name.
RS