This project rocks and uses MIT-LICENSE.
Install clearance files
rails g clearance:install
create authentications migration for omniauth
rake clearance_omniauth:install:migrations # Copy migrations from clearance_omniauth to application
Install omniauth config file
rails g clearance_omniauth:install
Add the service keys of your choice to config/initializers/omniauth.rb
mount the engine at /auth; That’s where omniauth expects it to be add this to your routes
mount ClearanceOmniauth::Engine => "/auth"