sudo apt-get install build-essential cmake qt4-qmake libx11-dev libcv-dev libcvaux-dev libhighgui4 libhighgui-dev libqt4-dev libpam0g-dev

cd /tmp

wget [URL]http://pam-face-authentication.googlecode.com/files/pam-face-authentication-0.3.tar.gz[/URL]

tar zxf pam-face-authentication-0.3.tar.gz && cd pam-face-authentication-*

mkdir build && cd build

cmake -D CMAKE_INSTALL_PREFIX=/usr ..

make

sudo make install

qt-facetrainer

sudo sed -i '1i auth sufficient pam_face_authentication.so enableX' /etc/pam.d/su
sudo sed -i '1i auth sufficient pam_face_authentication.so enableX' /etc/pam.d/sudo

sudo sed -i '1i auth sufficient pam_face_authentication.so enableX' /etc/pam.d/gdm
sudo sed -i '1i auth sufficient pam_face_authentication.so enableX' /etc/pam.d/gnome-screensaver

sudo sed -i '1i auth sufficient pam_face_authentication.so enableX' /etc/pam.d/kde

cat << EOF | sudo tee /usr/share/pam-configs/face_authentication /dev/null
Name: face_authentication profile
Default: yes
Priority: 900
Auth-Type: Primary
Auth:
[success=end default=ignore] pam_face_authentication.so enableX
EOF

sudo pam-auth-update --package face_authentication