{ desktop, lib, pkgs, ... }: { environment.systemPackages = with pkgs; [ ] ++ lib.optionals (desktop != null) [ gnome.simple-scan ]; hardware = { sane = { enable = true; #extraBackends = with pkgs; [ hplipWithPlugin sane-airscan ]; extraBackends = with pkgs; [ sane-airscan ]; }; }; }