C:\>cd devkit
C:\devkit>ruby dk.rb init
[INFO] found RubyInstaller v1.9.3 at C:/Ruby
Initialization complete! Please review and modify the auto-generated
'config.yml' file to ensure it contains the root directories to all
of the installed Rubies you want enhanced by the DevKit.
C:\devkit>ruby dk.rb install
[INFO] Updating convenience notice gem override for 'C:/Ruby'
[INFO] Installing 'C:/Ruby/lib/ruby/site_ruby/devkit.rb'