title: Can't use OpenCV namespace
body: <p>I'm trying to install OpenCV and thought I was done... But this has errors:</p>
  
  <pre><code>#include &lt;cv.h&gt;
  #include &lt;highgui.h&gt;
  
  using namespace cv;
  
  int main( int argc, char** argv )
  {
  }
  </code></pre>
  
  <p><code>Error: Symbol 'cv' could not be resolved</code></p>
  
  <p>But apparently the two includes include just fine. The code itself is taken from an example on OpenCV.org so I assume the code is right. And I'm too n00b to diagnose what the problem is, only vaguely knowing what namespaces are...</p>