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