title: Can't update Ruby resulting in Rails error
body: <p>I checked the list for   <a href="http://railsapps.github.io/installrubyonrails-mac.html" rel="nofollow">http://railsapps.github.io/installrubyonrails-mac.html</a>  trying to reinstall Rails and have been trying to update it for the last 2+ hours. </p>
  
  <p>This is what I get at the terminal:</p>
  
  <pre><code>Stevens-MBP:Desktop Steven$ rvm install ruby-2.3.1
  Searching for binary rubies, this might take some time.
  No binary rubies available for: osx/10.11/x86_64/ruby-2.3.1.
  Continuing with compilation. Please read 'rvm help mount' to get more    information on binary rubies.
  Checking requirements for osx.
  ==&gt; Upgrading 1 outdated package, with result:
  automake 1.15
  Error: You must `brew link autoconf` before automake can be installed
  Requirements installation failed with status: 1.
  </code></pre>
  
  <p>Here is additional information:</p>
  
  <pre><code>Stevens-MBP:Desktop Steven$ rails -v
  Rails is not currently installed on this system. To get the latest version,  simply type:
  
  $ sudo gem install rails
  
  You can then rerun your "rails" command.
  Stevens-MBP:Desktop Steven$ ruby -v
  ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin14.0]
  Stevens-MBP:Desktop Steven$ 
  </code></pre>
  
  <p>When I type <code>sudo gem install rails</code> I get:</p>
  
  <pre><code>ERROR:  Error installing rails:
   activesupport requires Ruby version &gt;= 2.2.2.
  </code></pre>