anchor.diff:  ```
   
   
  -[[building-the-example]]
  -Building the Example
  -~~~~~~~~~~~~~~~~~~~~
  +# Building the Example
   
   [source,bash]
   ----
  
positive.code:   * src/Hello.cpp - A source file to compile
    * src/main.cpp - The source file with main
  
  [[concepts]]
  Concepts
  ~~~~~~~~
  
  [[adding-static-library]]
  Adding a Static Library
  ^^^^^^^^^^^^^^^^^^^^^^^
  
  The +add_library()+ function is used to create a library from some source files.
  This is called as follows:
  
negative.code: This will be used to create a static library with the name libhello_library.a with
  the sources from the +library_SOURCES+ variable.
  
  ## Linking a Library
  
  When creating an executable that will use your library you must tell the compiler
  about the library. This can be done using the +target_link_library()+ function.
  