anchor.diff:        restartIfChanged = false;
   
         environment = {
  -        XKB_BINDIR = "${xorg.xkbcomp}/bin"; # Needed for the Xkb extension.
  +        XKB_BINDIR = "${pkgs.xkbcomp}/bin"; # Needed for the Xkb extension.
           XORG_DRI_DRIVER_PATH = "${pkgs.opengl-dummy.driverSearchPath}/lib/dri"; # !!! Depends on the driver selected at runtime.
           LD_LIBRARY_PATH =
             concatStringsSep ":" (
               [
  -              "${xorg.libX11}/lib"
  -              "${xorg.libXext}/lib"
  +              "${pkgs.libx11}/lib"
  +              "${pkgs.libxext}/lib"
                 "${pkgs.opengl-dummy.driverSearchPath}/lib"
               ] ++ concatLists (catAttrs "libPath" cfg.drivers)
             );
  
positive.code:             attrByPath [name] (
                if xorg ? ${"xf86video" + name} then {
                  modules = [ xorg.${"xf86video" + name} ];
                } else if ${"xf86-video-" + name} then {
                  modules = [ ${"xf86-video-" + name} ];
                } else null)
                knownVideoDrivers;
            in
  
negative.code:       ];
      };
      intel = {
        modules = [
          pkgs.xf86-video-intel
        ];
        driverName = "intel";
        extraConfig = ''
  