title: any tips for convenient including third-party library by Eclipse CDT?
body: <p>Currently I have a project developed based on several C++ third-party libraries, such as
  Eigen,vtk. For convenience, I install these libraries in the standard path, e.g. 
  /usr/local/include/eigen3, /usr/local/include/vtk-6.2.
  In this case, I do not need to add extra paths in eclipse project.</p>
  
  <p>And in Eclipse project, I can include them like this:</p>
  
  <pre><code>#include &lt;eigen3/Eigen/Core&gt;
  
  #include &lt;vtk-6.2/vtkAutoInit.h&gt;
  </code></pre>
  
  <p>Now my question is: How to include these libraries simply like this:</p>
  
  <pre><code>#include &lt;Eigen/Core&gt;
  
  #include &lt;vtkAutoInit.h&gt;
  </code></pre>
  
  <p>that is, libraries installed in /usr/local/include or /usr/include as a sub folder? Thanks!</p>