$ rails g rspec:install
Expected boolean default value for '--markerb'; got :erb (string)
Expected string default value for '--rc'; got false (boolean)
Expected string default value for '--helper'; got true (boolean)
Expected string default value for '--assets'; got true (boolean)
Expected string default value for '--rc'; got false (boolean)
Could not find generator 'rspec:install'. Maybe you meant 'devise:install', 'responders:install' or 'assets'
Run `rails generate --help` for more options.
Realice la siguiente instalación gem install rspec -v 2.14.1 y el bundle install correspondiente.
Muchas gracias por la colaboración.