anchor.diff:  
   If you're using {uri-rvm}[RVM], we recommend creating a new gemset to work with {project-name}:
   
  - $ rvm use 2.2@asciidoctor-pdf --create
  + $ rvm use 2.3@asciidoctor-pdf --create
   
   We like RVM because it keeps the dependencies required by various projects isolated.
   
  
positive.code: 
  == Prerequisites
  
  All that's needed is Ruby (1.9.3 or above; 2.2.x recommended) and a few Ruby gems, which we explain how to install in the next section.
  
  To check if you have Ruby available, use the `ruby` command to query the version installed:
  
  
negative.code: 
  Assuming all the required gems install properly, verify you can run the `asciidoctor-pdf` script using Ruby:
  
   $ bundle exec ./bin/asciidoctor-pdf -v
  
  If you see the version of {project-name} printed, you're ready to use {project-name}!
  