I installed Squid in my box by compiling the source code and then, installing it. Luckily, I have made it running with the configurations
I want. Now, I want to know how to make it automatically start-up during reboots.

Thanks,

Execute the following comands only if you have qmailctl, if not, tell me:

ln -s /var/qmail/bin/qmailctl /usr/bin

execute the following commands, replacing INITDIR with the location of your system's init.d directory and RCDIR with the location of your system's rc.d directories:

ln -s /var/qmail/bin/qmailctl INITDIR/qmail

ln -s ../init.d/qmail RCDIR/rc0.d/K30qmail

ln -s ../init.d/qmail RCDIR/rc1.d/K30qmail

ln -s ../init.d/qmail RCDIR/rc2.d/S80qmail

ln -s ../init.d/qmail RCDIR/rc3.d/S80qmail

ln -s ../init.d/qmail RCDIR/rc4.d/S80qmail

ln -s ../init.d/qmail RCDIR/rc5.d/S80qmail

ln -s ../init.d/qmail RCDIR/rc6.d/K30qmail

in redhat type the following

chkconfig --level 345 squid on

What does Qmail or qmailctl have to do with the Squid proxy?