title: qmake can't evaluate a proper variable
body: <p>I'd like to share my build version in the app but I can't get that thing to work... this is a part of my .pro file...</p>
  
  <pre><code>LITERAL_HASH = "foo";
  BUILD = "$${LITERAL_HASH}{\"sexy Installer\"},(0x12345678),1,0,3";
  DEPLOYMENT.installer_header = $$(BUILD);
  
  message(bar .$$(BUILD).)
  </code></pre>
  
  <p>and when I run qmake from Qt menu the output is:</p>
  
  <pre><code>Project MESSAGE: bar ..
  </code></pre>
  
  <p>I'm doing everything according to the docs and still that variable seems to be empty... </p>