title: Trouble installing Ruby (Failed to download resource "readline--patch")
body: <p>I'm getting this error when I try to install Ruby. I've tried looking at <a href="https://github.com/rbenv/ruby-build/issues/526" rel="nofollow noreferrer">this</a> and <a href="https://stackoverflow.com/questions/31777019/installing-rails-on-mac-os-fails-with-several-errors">this</a> but to no avail</p>
  
  <p><a href="https://i.stack.imgur.com/CtPiC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CtPiC.png" alt=""></a></p>
  
  <pre><code>➜  ~ brew install ruby
  Warning: You are using OS X 10.12.
  We do not provide support for this pre-release version.
  You may encounter build failures or other breakages.
  Please create pull-requests instead of filing issues.
  ==&gt; Installing dependencies for ruby: readline, libyaml, makedepend
  ==&gt; Installing ruby dependency: readline
  ==&gt; Downloading https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz
  ==&gt; Downloading from http://mirror.team-cymru.org/gnu/readline/readline-6.3.tar.gz
  ######################################################################## 100.0%
  ==&gt; Downloading https://gist.githubusercontent.com/jacknagel/d886531fb6623b60b2af/
  
  curl: (22) The requested URL returned error: 404 Not Found
  Error: Failed to download resource "readline--patch"
  Download failed: https://gist.githubusercontent.com/jacknagel/d886531fb6623b60b2af/raw/746fc543e56bc37a26ccf05d2946a45176b0894e/readline-6.3.8.diff
  </code></pre>