opencv2 on natty

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
apt-get install g++-4.6 libgtk2.0-dev pkg-config

opencv 2.4.11:
http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.11/