anchor.diff:        since picom v6 and was subsequently removed by upstream.
         See https://github.com/yshui/picom/commit/bcbc410
       '')
  +    (mkRemovedOptionModule [ "services" "picom" "experimentalBackends" ] ''
  +      This option was removed by upstream since picom v10.
  +    '')
     ];
   
     options.services.picom = {
  
positive.code:       };
  
        serviceConfig = {
          ExecStart = "${pkgs.picom}/bin/picom --config ${configFile}"
            + (optionalString cfg.experimentalBackends " --experimental-backends");
          RestartSec = 3;
          Restart = "always";
        };
  
negative.code:       default = false;
        description = lib.mdDoc ''
          Whether or not to enable Picom as the X.org composite manager.
        '';
      };
  
  