title: opencv ubuntu 12.04 Cmake error : Source directory does not appear to contain CmakeLists.txt
body: <p>I'm using Ubuntu 12.04. I was trying to install OpenCV using the steps shown in <a href="http://karytech.blogspot.in/2012/05/opencv-24-on-ubuntu-1204.html" rel="noreferrer">http://karytech.blogspot.in/2012/05/opencv-24-on-ubuntu-1204.html</a></p>
  
  <p>But when it comes to the step for Compiling, i get an error :</p>
  
  <pre><code>clive@clive-Aspire-4755:~/OpenCV-2.4.0/build$ cmake -D WITH_QT=ON -D WITH_XINE=ON -D WITH_OPENGL=ON -D WITH_TBB=ON -D BUILD_EXAMPLES=ON ..
  
  CMake Error: The source directory "/home/clive" does not appear to contain CMakeLists.txt.
  Specify --help for usage, or press the help button on the CMake GUI.
  </code></pre>
  
  <p>Can anyone help me?</p>
  
  <p>NOTE : The CMakeLists.txt file is present in the folder OpenCV-2.4.0 and not inside build. </p>