anchor.diff:  For example, to push a define `ZLIB_DLL` onto users of a library, one might use
   the following:
   
  +[source,lua]
   ---------------------------------------------------
   SharedLibrary {
       Name = "zlib",
  
positive.code: appending them to the environment.
  
  .Config ReplaceEnv Synopsis
  -----------------------------------------------------------------------------
  Config {
      Name = "foo-bar",
  
negative.code: inherit settings further by applying a new `Inherit` property.
  
  .Inherit Synopsis
  [source,lua]
  -----------------------------------------------------------------------------
  local foo_common = { ... }
  local bar_common = { ..., Inherit = foo_common, }
  