anchor.diff:        hba_file = '${pkgs.writeText "pg_hba.conf" cfg.authentication}'
         ident_file = '${pkgs.writeText "pg_ident.conf" cfg.identMap}'
         log_destination = 'stderr'
  +      port = ${toString cfg.port}
         ${cfg.extraConfig}
       '';
   
  
positive.code:         type = types.bool;
          default = false;
          description = ''
            Whether to run PostgreSQL with -i flag to enable TCP/IP connections.
          '';
        };
  
  
negative.code: 
        port = mkOption {
          type = types.int;
          default = 5432;
          description = ''
            The port on which PostgreSQL listens.
          '';
        };
  
  