Option 1

• Download Ruby and RubyGems
• Install Ruby
• Install RubyGems
• Get to the command-line and type:

sudo gem install rails --include-dependencies

Option 2

• Download Locomotive
• Install Ruby on Rails software from Locomotive

Option 3

• Use the broken Ruby installation on OSX 10.4 and follow this guide

RMagic

A shellscript has been made that will install everything you need to make RMagic work on your OS X box. Copy the contents, save it as a file and run the file through a terminal (by navigating to the file and type ./name_of_file.