anchor.diff:  )
   ----
   
  -[[building-the-example]]
  -Building the example
  -~~~~~~~~~~~~~~~~~~~~
  +# Building the example
   
   [source,bash]
   ----
  
positive.code:   * sublibrary2/CMakeLists.txt - to setup header only library
    * sublibrary2/inc/sublib2.h
  
  [[concepts]]
  Concepts
  ~~~~~~~~
  
  [[add-sub-dir]]
  Adding a Sub-Directory
  ^^^^^^^^^^^^^^^^^^^^^^
  
  A CMakeLists.txt file can include and call sub-directories which include a CMakeLists.txt
  files.
  
negative.code: |=======================================================================
  
  
  ## Referencing Libraries from Sub-Projects
  
  If a sub-project creates a library, it can be referenced by other projects by
  calling the name of the project in the `target_link_libraries()` command. This
  