RubyGems Frequently Asked Questions | RubyGems Manuals

Not every library has a strict mapping between the name of the gem and the name of the file you need to require. First you should check to see if the files match correctly: $ gem list RedCloth *** LOCAL GEMS *** RedCloth (4.1.1) $ ruby -rubygems -e 'require "RedCloth"' /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- RedCloth (LoadError) from

[chlono]

インストールされてるはずのgemが見つからない場合は見てる場所が違うかもしれないよ、な話