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[Anushree <anushrivb@xxxxxxxxx>]

The bug occurs because Qt 5 is installed before the installation of Open CV.
First uninstall Qt 5 then,
Folow the folowing steps to install Open CV:
>>sudo apt-get update
>>sudo apt-get upgrade

Install the dependencies 
>>sudo apt-get install build-essential libgtk2.0-dev libjpeg-dev libtiff4-dev libjasper-dev libopenexr-dev cmake python-dev python-numpy python-tk libtbb-dev libeigen3-dev yasm libfaac-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev libqt4-dev libqt4-opengl-dev sphinx-common texlive-latex-extra libv4l-dev libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev default-jdk ant libvtk5-qt4-dev

>>cd ~
>>wget http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.9/opencv-2.4.9.zip
>>unzip opencv-2.4.9.zip
>>cd opencv-2.4.9

>>mkdir build
>>cd build
>>cmake -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_VTK=ON ..

>>make
>>sudo make install


** Attachment added: "solution"
   https://bugs.launchpad.net/ubuntu/+source/opencv/+bug/1516493/+attachment/4519914/+files/solution

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https://bugs.launchpad.net/bugs/1516493

Title:
  Qt configuration error while installing opencv

Status in opencv package in Ubuntu:
  In Progress

Bug description:
   Could not find a package configuration file provided by "Qt5Concurrent"
    with any of the following names:

      Qt5ConcurrentConfig.cmake
      qt5concurrent-config.cmake

    Add the installation prefix of "Qt5Concurrent" to CMAKE_PREFIX_PATH or set
    "Qt5Concurrent_DIR" to a directory containing one of the above files.  If
    "Qt5Concurrent" provides a separate development package or SDK, be sure it
    has been installed.
  Call Stack (most recent call first):
    CMakeLists.txt:466 (include)

  
  qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory
  CMake Error at /usr/share/cmake-3.2/Modules/FindQt4.cmake:1326 (message):
    Found unsuitable Qt version "" from NOTFOUND, this code requires Qt 4.x
  Call Stack (most recent call first):
    cmake/OpenCVFindLibsGUI.cmake:34 (find_package)
    CMakeLists.txt:466 (include)

  
  -- Configuring incomplete, errors occurred!

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