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Checklist for installing bugzilla on a Red Hat Enterprise Linux 5.X:
Download the latest stable version (3.6.3) of bugzilla from the website (http://www.bugzilla.org/)
In RHEL5 make sure you install the apache web server that comes with the OS
Configure the firewall for apache
In RHEL5 make sure you install MySql database that comes with the OS
Configure the firewall for MySql
Para o resto da lista, leia a entrada do blog relevante.