title: Symbol 'cv' could not be resolved in eclipse
body: <p>I am trying to config openCV in eclipse, in include path i have added </p>
  
  <pre><code>/usr/local/include/opencv
  /usr/local/include
  </code></pre>
  
  <p>and i have used  pkg-config --libs opencv to add some library in GCC C++ Linker:</p>
  
  <pre><code>/usr/local/lib/libopencv_calib3d.so
  /usr/local/lib/libopencv_contrib.so
  ...
  </code></pre>
  
  <p>in header file i included:</p>
  
  <pre><code>#include &lt;opencv2/highgui/highgui.hpp&gt;
  #include &lt;opencv2/core/eigen.hpp&gt;
  </code></pre>
  
  <p>but when i declare </p>
  
  <pre><code>using namespace cv;
  </code></pre>
  
  <p>i get an error: Symbol 'cv' could not be resolved </p>