anchor.diff:  in {
     options.nixsap.apps.pgbackup = {
   
  -    package = mkOption {
  -      description = "PostgreSQL package providing pg_dump";
  -      type = package;
  -      default = pkgs.postgresql;
  -    };
  -
       user = mkOption {
         description = "User to run as";
         default = "pgbackup";
  
positive.code:        else if isString v then "--${k}='${v}'"
         else "--${k}=${toString v}" ;
  
        # XXX: Use the latest pg_dump:
        pg_dump = pkgs.writeBashScript name ''
          ${optionalString (cfg.pgpass != null) "export PGPASSFILE='${cfg.pgpass}'"}
          exec ${cfg.package}/bin/pg_dump \
            ${concatMapAttrsSep " " mkArg args} \
            "$@"
        '';
  
negative.code: 
    command = sub
      {
        package                 = default pkgs.postgresql package;
        blobs                   = optional bool;
        clean                   = optional bool;
        compress                = default 9 int;
  