Compile opencv 3.1.0 for ubuntu with virtualenv

install-and-compile-cv2.sh

#!/bin/bash
# from http://www.pyimagesearch.com/2016/10/24/ubuntu-16-04-how-to-install-opencv/
 sudo apt-get install build-essential cmake pkg-config libjpeg8-dev libtiff5-dev libjasper-dev libpng12-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libgtk-3-dev libatlas-base-dev gfortran python2.7-dev python3.5-dev -y
wget -O opencv.zip https://github.com/Itseez/opencv/archive/3.1.0.zip

unzip opencv.zip

#contribut packages
wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/3.1.0.zip
unzip opencv_contrib.zip

#install virtualenv
sudo pip install virtualenv virtualenvwrapper
echo -e "\n# virtualenv and virtualenvwrapper" >> ~/.bashrc
echo "export WORKON_HOME=$HOME/.virtualenvs" >> ~/.bashrc
echo "source /usr/local/bin/virtualenvwrapper.sh" >> ~/.bashrc
 # same for zsh
echo -e "\n# virtualenv and virtualenvwrapper" >> ~/.zshrc
echo "export WORKON_HOME=$HOME/.virtualenvs" >> ~/.zshrc
echo "source /usr/local/bin/virtualenvwrapper.sh" >> ~/.zshrc
source ~/.zshrc

#create a virtual env "cv"
mkvirtualenv cv -p python2
# switch to the new virtualenv
workon cv
#install numpy (it will only install in the virtualenv)
pip install numpy
#compile opencv
cd opencv-3.1.0/
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D INSTALL_C_EXAMPLES=OFF \
    -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.1.0/modules \
    -D PYTHON_EXECUTABLE=~/.virtualenvs/cv/bin/python \
    -D BUILD_EXAMPLES=ON ..

make -j4 && sudo make install
sudo ldconfig

#link to virtualenv
cd ~/.virtualenvs/cv/lib/python2.7/site-packages/
ln -s /usr/local/lib/python2.7/site-packages/cv2.so cv2.so