title: Updating Brew error on Mac OS X
body: <p>I am trying to update brew on my Mac OS X machine so I can update php.  However, when trying to run <code>brew install</code>, I get this error:</p>
  
  <pre><code>error: The following untracked working tree files would be overwritten by merge:
      Library/Homebrew/extend/enumerable.rb
  Please move or remove them before you can merge.
  Aborting
  Error: Failure while executing: git pull --quiet origin refs/heads/master:refs/remotes/origin/master
  </code></pre>
  
  <p>brew doctor:</p>
  
  <p>Warning: Broken symlinks were found. Remove them with <code>brew prune</code>:
    /usr/local/bin/wget
    /usr/local/share/man/man1/wget.1
    /usr/local/Library/LinkedKegs/wget</p>