Tony - excellent as ever - your rpm saved me the hassle of building from source.
To put the icing on the cake, might I suggest including sarg realtime?
Creation of a php script (I call mine squid.php):
system("/usr/bin/sarg -f /etc/sarg/sarg.conf -r /var/log/squid/access.log");
Then access http://your_webserver_ip/sarg/squid.php
You may need to change the access permissions on /var/log/squid and all its contents (if you see the sarg realtime header, but no data).