title: QT can't find openCV's libs
body: <p>I've installed OpenCV via <a href="http://rodrigoberriel.com/2014/10/installing-opencv-3-0-0-on-ubuntu-14-04/" rel="nofollow">this</a> instruction.</p>
  
  <p>I use OpenCV when and build the code via cmake - and it's all ok. 
  But now I'm trying to use OpenCV from QT, and I get errors like this:</p>
  
  <pre><code> error: undefined reference to `cvCreateCameraCapture'
  </code></pre>
  
  <p>The same errors for all functions from OpenCV. </p>
  
  <p>I tried to add in .pro this code:</p>
  
  <pre><code>INCLUDEPATH += /usr/local/include/opencv2
  LIBS += -L/usr/local/lib
  LIBS += -lopencv_core
  LIBS += -lopencv_imgproc
  LIBS += -lopencv_highgui
  LIBS += -lopencv_ml
  LIBS += -lopencv_video
  LIBS += -lopencv_features2d
  LIBS += -lopencv_calib3d
  LIBS += -lopencv_objdetect
  LIBS += -lopencv_contrib
  LIBS += -lopencv_legacy
  LIBS += -lopencv_flann
  </code></pre>
  
  <p>But it isn't work. 
  The dir <code>/usr/local/include/opencv2</code> exist and not empty. </p>
  
  <p>So, what's wrong? </p>