anchor.diff:  in {
     # Backport module from unstable.
     imports = [ "${unstableTarball}/nixos/modules/hardware/opentabletdriver.nix" ];
  +  # disabledModules = [ "hardware/opentabletdriver.nix" ];
   
     nixpkgs = {
       config = {
  
positive.code: { config, pkgs, ... }:
  
  let
    unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz;
  
negative.code:         unstable = unstablePkgs;
          # Make a special opentabletdriver exception since it is needed by module above.
          opentabletdriver = unstablePkgs.opentabletdriver;
          linuxZenWMuQSS = pkgs.linuxPackagesFor (pkgs.linux_zen.override {
            structuredExtraConfig = with lib.kernel; {
              SCHED_MUQSS = yes;
            };
            ignoreConfigErrors = true;
          });
        })
      ];
    };
  