project site running at /var/www/localhost/htdocs
and bugzilla running at /var/www/bugzilla/htdocs

Running: Apache 2.0.58-r2

#bugzilla-vhost.conf
<VirtualHost *:999>
  ServerName 10.1.1.254
  DocumentRoot "/var/www/bugzilla/htdocs"
  Alias /bugzilla /var/www/bugzilla/htdocs
      <Directory "/var/www/bugzilla/htdocs">
          AddHandler cgi-script cgi
          Options +Indexes +ExecCGI +FollowSymLinks
          DirectoryIndex index.cgi
          AllowOverride All
          Order Allow,Deny
          Allow from All
       </Directory>
</VirtualHost>

#httpd.conf
<Directory /var/www/bugzilla>
  AddHandler cgi-script .cgi
  Options +Indexes +ExecCGI +FollowSymLinks
  DirectoryIndex index.cgi
  AllowOverride Limit
</Directory>