install opencv 3.3 from sources

install_opencv.sh

sudo apt-get install qt-sdk
then follow
#http://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html
sudo apt-get install build-essential
#install python header and includes 
#
sudo apt-get install python2.7-dev
sudo apt-get install python3.4-dev

sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
cd ~/git
git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_contrib.git
cd ~/git/opencv
mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=Release -D OPENCV_EXTRA_MODULES_PATH=~/git/opencv_contrib -D CMAKE_INSTALL_PREFIX=/usr/local .. -D PYTHON2_EXECUTABLE=~/venv2/bin/python.exe -D PYTHON_INCLUDE_DIR=~/venv2/include -D PYTHON_LIBRARY=~/venv2/lib -D PYTHON2_NUMPY_INCLUDE_DIRS=~/venv2/lib/python2.7/site-packages/numpy/core/include
#Use cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local .. , without spaces after -D if the above example doesn't work.