title: How to install subversion using homebrew on OSX
body: <p>i tried</p>
  
  <pre><code>$ brew install subversion
  </code></pre>
  
  <p>and see</p>
  
  <pre><code>Error: Cannot write to /usr/local/Cellar
  </code></pre>
  
  <p>Am I missing anything?</p>