F:\>cd DevKit
F:\DevKit>ruby dk.rb init
[INFO] found RubyInstaller v2.3.1 at F:/Ruby23
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.
F:\DevKit>config.yml
F:\DevKit>ruby dk.rb review
Based upon the settings in the 'config.yml' file generated
from running 'ruby dk.rb init' and any of your customizations,
DevKit functionality will be injected into the following Rubies
when you run 'ruby dk.rb install'.
F:/Ruby23
F:\DevKit>ruby dk.rb install
[INFO] Updating convenience notice gem override for 'F:/Ruby23'
[INFO] Installing 'F:/Ruby23/lib/ruby/site_ruby/devkit.rb'
F:\DevKit>gem install json --platform=ruby
Fetching: json-2.0.2.gem (100%)
ERROR: Error installing json:
The 'json' native gem requires installed build tools.
Please update your PATH to include build tools or download the DevKit