I was installing bugzilla 3.6.3 i have a dependency for DBD::mysql 4.0 currently DBD::mysql installed on the system is 3.0.This is a centos machine and if any one let me know how to install this DBD::mysql 4 will be pretty useful.
run cpan then install DBD::mysql
you may need to update the whole bundle so substitute
See http://www.bugzilla.org/docs/3.6/en/html/installation.html and the section "2.1.5. Perl Modules".
The script in the package would make it easier to download and install all Perl modules required.