Unfortunately, I don't have a mac to test with, so someone else will have to step up and tell you how it's done. Although, once you have MySQL, Ruby and RubyGems installed, I think the README should be of help.
I have all installed ready for the system, looking through the README at present, so will give it a bash. Using SQLite, would you forsee any problems with that over MySQL?
Tried it on Windows too, but not all the gems install unfortunately.
Humm.. I've tried to stay clear of MySQL-isms, but some might have slipped through. Please let me know how it goes, and if something breaks I'm sure we can try and work around it.
Going great guns with the install, using MySQL as suggested. Currently modifying the environment and juggernaut files, unsure as to what I should be modifying them to for a localhost install. Do you have an idea? Using Apache 1.3, MySQL and databases set up via PhpMyAdmin.
Juggernaut can be ignored until you've got everything else set up. The environment.rb file is mostly the domain you want to run under, and your email server settings. For a local install, pick any domain you want and set the IP address to 127.0.0.1 via /etc/hosts