anchor.diff:    * PROTO_HDRS- Name of the variable that will store the .pb.h files.
     * AddressBook.proto - The .proto file to generate code from.
   
  -[[generated-files]]
  -Generated Files
  -^^^^^^^^^^^^^^^
  +## Generated Files
   
   After the `PROTOBUF_GENERATE_CPP` function is called, you will have the above
   mentioned variables available. These will be marked as the output to a custom command
  
positive.code: autogenerated again. However, if no changes are made to the .proto file and you re-run
  make, then nothing will be done.
  
  [[building-the-example]]
  Building the Example
  ~~~~~~~~~~~~~~~~~~~~
  
  [source,bash]
  ----
  
negative.code: = Protobuf Code Generation
  :toc:
  :toc-placement!:
  
  toc::[]
  
  # Introduction
  
  This example shows how to generate source files using https://github.com/google/protobuf[protobuf].
  Protocol Buffers is a data serialization format from Google. A user provides a
  