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: Introduction
  ------------
  The purpose of this document is to guide readers through the configuration
  steps to use two factor authentication for SSH using Yubikey. This document
  
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.
  