For example, the Rakefile in the rubykoans.com download is just this:
#!/usr/bin/env ruby
# -*- ruby -*-
require 'rake/clean'
require 'rake/testtask'
task :default => :test
task :test do
ruby 'path_to_enlightenment.rb'
end
while the Rakefile in the repository is much longer.
rake gen and rake regen are not even supported by the rubykoans.com download, even though it's mentioned in the accompanying readme.