Installing mod-authnz-external on Debian 5.0 (Lenny)
1) install the debian-archive-keyring package
apt-get install debian-archive-keyring
2) Add the following configuration line to /etc/apt/sources.list
deb http://backports.debian.org/debian-backports lenny-backports main contrib non-free
3) Update apt's sources
apt-get update
4) Install the mod
apt-get install libapache2-mod-authnz-external
5) Enable the mod
a2enmod authnz_external
6) Restart Apache so the mod becomes active
/etc/init.d/apache2 reload
