title: Shared data location for Linux and Mac OS X
body: <p>On Windows, there is a standard location for application data that is shared in common with all users on the machine (i.e. in Vista/7, <code>(root):\ProgramData</code>). I'm looking for a way to get such a folder on other platforms using Qt.</p>
  
  <ul>
  <li>Does Qt provide a built-in method for doing this? (<a href="http://doc.qt.nokia.com/latest/qdesktopservices.html#StandardLocation-enum" rel="nofollow noreferrer">QDesktopServices</a> looked promising, but does not seem to provide this option.)</li>
  <li>If not, what are the standard locations on Linux and Mac OS X systems for shared application data? Is <code>/usr/share</code> the correct place? Is there a standard at all?</li>
  </ul>
  
  <p><strong>[CLARIFICATION]</strong> This is for mutable data.</p>