anchor.diff:          </programlisting>
           See <code>nixpkgs.localSystem</code> for more information.
   
  +        Ignored when <code>nixpkgs.localSystem</code> is set.
           Ignored when <code>nixpkgs.pkgs</code> is set.
         '';
       };
  
positive.code: 
      localSystem = mkOption {
        type = types.attrs; # TODO utilize lib.systems.parsedPlatform
        default = { system = builtins.currentSystem; };
        example = { system = "aarch64-linux"; config = "aarch64-unknown-linux-gnu"; };
        defaultText = literalExample
          ''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
  
negative.code: 
      system = mkOption {
        type = types.str;
        default = cfg.localSystem.system
          or opts.localSystem.default.system;
        example = "i686-linux";
        description = ''
          Specifies the Nix platform type on which NixOS should be built.
  