sudo gem install jekyll

ERROR:  While generating documentation for jekyll-0.12.1
... MESSAGE:   Unhandled special: Special: type=17, text="<!-- more -->"
... RDOC args: --ri --op /usr/lib/ruby/gems/1.8/doc/jekyll-0.12.1/ri --charset=UTF-8 lib README.textile LICENSE --title jekyll-0.12.1 Documentation --quiet

sudo gem install rdoc

sudo gem install jekyll