opencv2.4 install

#remove all previous opencv files
#sudo xargs rm < install files in build direct to remove previous files.
# cmake -DENABLE_PRECOMPILED_HEADERS=OFF added as per https://github.com/opencv/opencv/issues/6517

mydir="$HOME/test"
mkdir -p "$mydir"
mkdir -p "$mydir/opencvbackup"
cd "$mydir"
git clone https://github.com/opencv/opencv_contrib.git
git clone https://github.com/opencv/opencv.git
cp -R "$mydir/opencv" "$mydir/opencvbackup"
cd "$mydir/opencv"
git checkout 2.4
mkdir "$mydir/opencv/build"
cd "$mydir/opencv/build"
cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D ENABLE_PRECOMPILED_HEADERS=OFF \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D INSTALL_C_EXAMPLES=ON \
      -D INSTALL_PYTHON_EXAMPLES=ON \
      -D WITH_TBB=ON \
      -D WITH_V4L=ON \
      -D WITH_QT=ON \
      -D WITH_OPENGL=ON \
      -D OPENCV_EXTRA_MODULES_PATH="$mydir/opencv_contrib" \
      -D PYTHON_EXECUTABLE=/usr/bin/python2.7 \
      -D BUILD_EXAMPLES=ON ..
make -j4
sudo make install
sudo ldconfig