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This step by step guide is derived from the installation instructions which you can find at yourdomain.com/doc/acs-authentication/ext-auth-pam-install.html. It is build upon PAM 0.77 (tested) and does not work on RedHat Linux Enterprise 3 (using PAM 0.75). It makes use of the ns_pam module written by Mat Kovach. The instructions given in here do work with PAM LDAP accordingly and differences will be shown at the end of the file.