anchor.diff:  {config, pkgs, ...}:
   
   let
  -  inherit (pkgs.lib) mkOption addDefaultOptionValues;
  +  inherit (pkgs.lib) mkOption addDefaultOptionValues types;
   
     perServerOptions = {forMainServer}: {
   
  
positive.code:             documentRoot = "/data/webroot-bar";
            }
          ];
          description = ''
            Specification of the virtual hosts served by Apache.  Each
            element should be an attribute set specifying the
  
negative.code:           are the non-global options permissible for the main host.
          '';
  
          options = [
            vhostOptions
          ];
        };
  
      }
      // perServerOptions {forMainServer = true;}
      ;
    };
  }
  