rubygems/rubygems — pull request #247 by BanzaiMan (2011-12-31 01:28:01+00:00)
Title: JRuby's 'Syck' is 'Yecht'

So `Syck` should be equal to `YAML::Yecht`. This solves the problem described in http://stackoverflow.com/questions/8674480/rails-3-2-on-jruby-gemspec-errors, where JRuby fails to install Rails 3.2.0.rc1.