title: Error installing Jekyll, requires Ruby >= 2.0.0
body: <p>I get the error </p>
  
  <pre><code>Error installing jekyll:
  jekyll requires Ruby version &gt;= 2.0.0.
  </code></pre>
  
  <p>when I run </p>
  
  <pre><code>sudo gem install jekyll
  </code></pre>
  
  <p>"ruby -v" says I have ruby version 1.9.3</p>
  
  <p>How do I install Jekyll?  Do I need to upgrade ruby?  If so, how?</p>
  
  <p>Update - I installed ruby 2.0.0 with rvm but get the same error.  Since trying to install with gem, could that still be trying to install with the older version of ruby?  If so, how to find and change?</p>