Bugzilla is written in perl. It can be downloaded here http://www.bugzilla.org/download/

You need to have a web server. I personally like MAMP.

As mentioned it is in perl. So, when you run 'checksetup.pl' you will get a list of things you need to install. You install these things with CPAN, today I found a way to always be running 'sudo make' instead of just make. If you ain't sudo, you ain't going to be happy.

at shell prompt:
sudo cpan
then you enter:

o conf make_install_make_command 'sudo make'
o conf commit
q

That should help!
These are the things I need to install!

GDGraph: /usr/bin/perl -MCPAN -e 'install "GD::Graph"'
GDTextUtil: /usr/bin/perl -MCPAN -e 'install "GD::Text"'
Template-GD: /usr/bin/perl -MCPAN -e 'install "Template::Plugin::GD::Image"'
GD: /usr/bin/perl -MCPAN -e 'install "GD"'
Email-Reply: /usr/bin/perl -MCPAN -e 'install "Email::Reply"'
Email-MIME-Attachment-Stripper: /usr/bin/perl -MCPAN -e 'install "Email::MIME::Attachment::Stripper"'
perl-ldap: /usr/bin/perl -MCPAN -e 'install "Net::LDAP"'
HTML-Scrubber: /usr/bin/perl -MCPAN -e 'install "HTML::Scrubber"'
HTML-Parser: /usr/bin/perl -MCPAN -e 'install "HTML::Parser"'
XML-Twig: /usr/bin/perl -MCPAN -e 'install "XML::Twig"'
Chart: /usr/bin/perl -MCPAN -e 'install "Chart::Base"'
PerlMagick: /usr/bin/perl -MCPAN -e 'install "Image::Magick"'
PatchReader: /usr/bin/perl -MCPAN -e 'install "PatchReader"'
SOAP-Lite: /usr/bin/perl -MCPAN -e 'install "SOAP::Lite"'
mod_perl: /usr/bin/perl -MCPAN -e 'install "mod_perl2"'
CGI.pm: /usr/bin/perl -MCPAN -e 'install "CGI"'

What I don't like about GD is it requires a bunch of other things to really work!