title: can't chown /usr/local for homebrew in Mac OS X 10.13 High Sierra
body: <p>Homebrew needs permissions in /usr/local and since no one else uses my laptop I have always simply done</p>
  
  <p><code>sudo chown -R $(whoami) $(brew --prefix)</code></p>
  
  <p>but in High Sierra, this gives</p>
  
  <p><code>chown: /usr/local: Operation not permitted</code></p>
  
  <p>What is the fix?</p>