title: Can't run Qt apps: version `Qt_5' not found
body: <p>I run Ubuntu 16.04 LTS. 
  My problem is that I am not able to run a Qt5 app, which I can compile.</p>
  
  <p>This is what I get when I try to run it:</p>
  
  <pre><code>/home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif: /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5: version `Qt_5' not found (required by /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif)
  /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5' not found (required by /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif)
  /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.6' not found (required by /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif)
  /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5: version `Qt_5' not found (required by /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif)
  /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5: version `Qt_5' not found (required by /home/user/Desktop/sconfig/dist/Release/GNU-Linux/SCongif)
  </code></pre>
  
  <p>I then removed Qt5 and purged all the remnants. Then I installed again Qt5.</p>
  
  <pre><code>user@user-P64V7:~$ which qmake
  /home/user/Qt5.8.0/5.8/gcc_64/bin/qmake
  user@user-P64V7:~$ qmake --version
  QMake version 3.1
  Using Qt version 5.8.0 in /home/user/Qt5.8.0/5.8/gcc_64/lib
  user@user-P64V7:~$ echo $PATH
  /home/user/Qt5.8.0/5.8/gcc_64/bin:/home/user/bin:/home/user/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
  </code></pre>
  
  <p>It could also be worth noting that I use Netbeans 8.2 and the QMake command is </p>
  
  <pre><code>/home/user/Qt5.8.0/5.8/gcc_64/bin/qmake
  </code></pre>
  
  <p>Any idea what I could be doing wrong?</p>
  
  <p>Thanks a lot!</p>