title: link GLFW and GLEW to QT-Creator
body: <p>I wanted to learn OpenGl with Cpp using QT-Creator but it seems that i didn't linked my GLFW lib right.</p>
  
  <p>I used</p>
  
  <pre><code>sudo apt-get install libglfw3 libglfw3-dev libglfw3-doc
  </code></pre>
  
  <p>and </p>
  
  <pre><code>sudo apt-get install libglew-dbg libglew-dev libglew1.13
  </code></pre>
  
  <p>to install them and afterwards, the QT_Creator "showed" me </p>
  
  <pre><code>//GLEW
  #include "GL/glew.h"
  //GLFW
  #include "GLFW/glfw3.h"
  </code></pre>
  
  <p>so I thought, I could use them, but i got an "undifened reference to ...".
  I already looked at <a href="https://stackoverflow.com/questions/27536364/cant-link-glfw-in-qtcreator">this question</a>, but it doesn't seem to work. And I never worked with CMake or qmake before, so i can't see my mistake.</p>