install package
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 libeigen2-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
download opencv-2.4.9
wget -O OpenCV-2.4.9.zip http://fossies.org/linux/misc/opencv-2.4.9.zip
unzip OpenCV-2.4.9.zip
build
cd opencv-2.4.9
mkdir debug ; cd debug
cmake -D CMAKE_INSTALL_PREFIX=/usr/local/opencv -D CMAKE_BUILD_TYPE:STRING=RelWithDebInfo -D CMAKE_BUILD_TYPE=DEBUG ..
make -j8 ; sudo make install
add library path
sudo vim /etc/ld.so.conf.d/opencv.conf
/usr/local/opencv/lib
sudo ldconfig
ldconfig -p | ag 'opencv'
bashrc configure
~/.bashrc
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/opencv/lib/pkgconfig
export PKG_CONFIG_PATH
test
cd opencv-2.4.9/samples/c
./build_all.sh
./facedetect lena.jpg