title: Qmake get the target output file path
body: <p>I have a qmake project that looks like this:</p>
  
  <pre><code>TEMPLATE = lib
  CONFIG += dll
  TARGET = mydll
  
  SOURCES += ...
  HEADERS += ....
  </code></pre>
  
  <p>Now I want to add an <code>INSTALLS</code> section, so I have:</p>
  
  <pre><code>target.path = /path/to/somedir/
  target.files =./$$TARGET
  
  INSTALLS+= target
  </code></pre>
  
  <p>Unfortunately this will not work, because <code>$$TARGET</code> contains the target name, and not the output file name. Is there a <strong>portable</strong> way to obtain the output file name? (Please no platform dependent string concatenation like <code>lib</code> + <code>$$TARGET</code> + <code>.so</code>)</p>