Installing Jekyll on OS X Revision as of Monday, 21 December 2015 at 02:30 UTC

• Install Xcode
• Run Xcode, go to Preferences
  • Sign-in under “Accounts”
  • Tab over to “Downloads” and click the teeny arrow for “Command
    Line Tools”
• Once installed, install Homebrew

 ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"

• Then install the Ruby Version Manager¹

 curl -L https://get.rvm.io | bash -s stable --ruby

• Source the RVM:

 source /usr/local/rvm/scripts/rvm

• Install Jekyll

 gem install jekyll

• Test. I did it by running jekyll serve from a
  Bootstrap download².

Footnotes