title: gitk not found on OSX Apple Git-55
body: <p>I am using git on OSX.</p>
  
  <p><code>git --version</code> returns</p>
  
  <pre><code>git version 2.3.2 (Apple Git-55)
  </code></pre>
  
  <p>From Googling, it seems this version should include <code>gitk</code>. But when I run the command, I get command not found.</p>
  
  <pre><code>gitk
  bash: gitk: command not found
  </code></pre>
  
  <p>Why is this, and how can I get gitk on OSX? I am not using homebrew.</p>