anchor.diff:      system = pkgs.stdenv.system;
       allPackages = import ./pkgs/top-level/all-packages.nix;
     };
  +
  +  nix = pkgs.nixUnstable; # we need the exportReferencesGraph feature
   
   
     # Determine the set of modules that we need to mount the root FS.
  
positive.code:       pkgs.less
        pkgs.nano
        pkgs.netcat
        pkgs.nix
        pkgs.perl
        pkgs.procps
        pkgs.rsync
  
negative.code:       pkgs.sysklogd
        pkgs.sysvinit
  #      pkgs.vim
        nix
        nixosInstaller
      ];
  
  