title: Couldn't display images under emacs-w3m on MacOS 10.9
body: <p>I am using emacs 24.3. </p>
  
  <p>I use the common setting that add to .emacs:</p>
  
  <p><code>(setq w3m-default-desplay-inline-images t)
  </code></p>
  
  <p>but it's not work. I also try to toggle to display image via <code>shortcut T</code> in emacs-w3m, it shows "Can't display images in this environment".</p>
  
  <p><img src="https://i.stack.imgur.com/P56IY.png" alt="enter image description here"></p>
  
  <p>It works totally fine on Ubuntu 12.04 LTS.</p>
  
  <p>Are there any ways to solve this problem?</p>