anchor.diff:        # Adapt from https://gitlab.gnome.org/GNOME/gnome-build-meta/blob/gnome-3-38/elements/core/meta-gnome-core-shell.bst
         environment.systemPackages = with pkgs.gnome; [
           adwaita-icon-theme
  +        nixos-background-info
           gnome-backgrounds
           gnome-bluetooth
           gnome-color-manager
  
positive.code: 
       ${pkgs.glib.dev}/bin/glib-compile-schemas $out/share/gsettings-schemas/nixos-gsettings-overrides/glib-2.0/schemas/
      '';
  
    flashbackEnabled = cfg.flashback.enableMetacity || length cfg.flashback.customSessions > 0;
    flashbackWms = optional cfg.flashback.enableMetacity {
  
negative.code:      chmod -R a+w $out/share/gsettings-schemas/nixos-gsettings-overrides
       cat - > $out/share/gsettings-schemas/nixos-gsettings-overrides/glib-2.0/schemas/nixos-defaults.gschema.override <<- EOF
         [org.gnome.desktop.background]
         picture-uri='file://${nixos-background-ligtht.gnomeFilePath}'
         picture-uri-dark='file://${nixos-background-dark.gnomeFilePath}'
  
         [org.gnome.desktop.screensaver]
         picture-uri='file://${nixos-background-dark.gnomeFilePath}'
  
         ${cfg.favoriteAppsOverride}
  
  