title: Qt project structure
body: <p>I want to structure my project in Qt-Creator like this:</p>
  
  <pre><code>MainProject
    main.pro
    SubProject
      sub.pro
      SubSubIncludes
        subsub.pri
  </code></pre>
  
  <p>I tried to achive this by creating the project- and include-files like this:</p>
  
  <p><strong>main.pro</strong></p>
  
  <pre><code>include(subproject/subproject.pro)
  </code></pre>
  
  <p><strong>subproject.pro</strong></p>
  
  <pre><code>include(subsubincludes/subsubincludes.pri)
  </code></pre>
  
  <p>What now happens is, that the subsubincludes folder is included to the <em>MainProject</em> instead of to the <em>SubProject</em> like this:</p>
  
  <pre><code>MainProject
    main.pro
    SubSubIncludes // WRONG INCLUDE
        subsub.pri // ALSO WRONG
    SubProject
      sub.pro
  </code></pre>