anchor.diff:  system administration, particularly for how PAM authentication mechanism is
   configured on a Linux platform.
   
  -Prerequisites
  --------------
  +=== Prerequisites ===
   
   Successful configuration of the Yubico PAM module to support two factor
   authentication requires following prerequisites:
  
positive.code:   (https://developers.yubico.com/yubico-pam/)
  
  
  System Requirements
  -------------------
  
  This document illustrates the configuration steps for Fedora Core 8
  operating system. However, there steps should work on most other Linux
  
negative.code: to the user.
  
  
  === Build yubico-c-client and pam_yubico ===
  
  Build instructions for yubico-c-client and pam_yubico are found in their
  respective README.
  