title: Qt build error: "WARNING: TARGET is empty" and "make: nothing to be done for "first""
body: <p>I recently installed qt5 on Raspbian. I'm trying to compile <a href="https://github.com/groupgets/LeptonModule/tree/master/software/raspberrypi_qt" rel="nofollow noreferrer">this package</a> so I ran<code>qmake &amp;&amp; make</code>. I get these errors:</p>
  
  <pre><code>WARNING: TARGET is empty
  make: nothing to be done for 'first'
  </code></pre>
  
  <p>Before having qt5 (and qt-creator), I can compile the code seamlessly with qt4 installed in my raspberry pi. So I think it could be some incompatibility issue with qt5. How can I build this code without having to revert back to qt4?</p>
  
  <p><em>Note: I'm new with Qt and Linux.</em></p>