title: gd enabled but still reports PHP Fatal error: Call to undefined function imagecreatefromjpeg()
body: <p>Has anyone met this problem ?</p>
  
  <p>I've checked the output of <code>phpinfo()</code>,and see <code>gd</code> is enabled.</p>
  
  <p><strong>UPDATE</strong></p>
  
  <p>I built PHP with <code>--with-gd</code>, but only <code>GIF Support</code> and <code>PNG Support</code> are in the output of phpinfo(), how do I enable <code>JPEG Support</code>?</p>