Invalid gemspec on what?!

This belongs to a royal PITA moment, thus needs a worthy post. I’m trying to do a

bundle install

with my Gemfile as follows:

group :development, :test do
  gem 'capybara'
  gem 'cucumber'
  gem 'cucumber-rails'
  gem 'database_cleaner'
  gem 'rspec-rails'
  gem 'autotest'
  gem 'spork'
  gem 'launchy'
end

At the time of writing this, these are the errors that I encountered. Since you are reading this, then I guess something is still wrong here.

Installing cucumber (1.0.6) 
Installing cucumber-rails (1.0.4) Invalid gemspec in [/Users/rupert/.rvm/gems/ruby-1.9.2-p180@cws/specifications/cucumber-rails-1.0.4.gemspec]: Illformed requirement ["#<Syck::DefaultKey:0x00000104b82a40> 0.7.2"]
 
Installing database_cleaner (0.6.7) Invalid gemspec in [/Users/rupert/.rvm/gems/ruby-1.9.2-p180@cws/specifications/cucumber-rails-1.0.4.gemspec]: Illformed requirement ["#<Syck::DefaultKey:0x00000104b82a40> 0.7.2"]
 
Installing orm_adapter (0.0.5) Invalid gemspec in [/Users/rupert/.rvm/gems/ruby-1.9.2-p180@cws/specifications/cucumber-rails-1.0.4.gemspec]: Illformed requirement ["#<Syck::DefaultKey:0x00000104b82a40> 0.7.2"]
 
Installing warden (1.0.5) Invalid gemspec in [/Users/rupert/.rvm/gems/ruby-1.9.2-p180@cws/specifications/cucumber-rails-1.0.4.gemspec]: Illformed requirement ["#<Syck::DefaultKey:0x00000104b82a40> 0.7.2"]
 
Installing devise (1.4.5) Invalid gemspec in [/Users/rupert/.rvm/gems/ruby-1.9.2-p180@cws/specifications/cucumber-rails-1.0.4.gemspec]: Illformed requirement ["#<Syck::DefaultKey:0x00000104b82a40> 0.7.2"]
 
Installing meta_programming (0.2.2) Invalid gemspec in [/Users/rupert/.rvm/gems/ruby-1.9.2-p180@cws/specifications/cucumber-rails-1.0.4.gemspec]: Illformed requirement ["#<Syck::DefaultKey:0x00000104b82a40> 0.7.2"]

Ok, avoid the PITA moment by reading this. And make the changes to the Gemfile like this:

group :development, :test do
  gem 'capybara'
  gem 'cucumber', "1.0.6"
  gem 'cucumber-rails', :git => "https://github.com/cucumber/cucumber-rails.git"
  gem 'database_cleaner'
  gem 'rspec-rails'
  gem 'autotest'
  gem 'spork'
  gem 'launchy'
end

Now, I understand why the commit message is like this: I EAT YAML AND RUBYGEMS FOR toot…