{ config, ... }: { assertions = [ { assertion = config.services.xserver.enable; message = "Redshift does not work without a desktop!"; } ]; services.redshift = { executable = "/bin/redshift-gtk"; enable = true; temperature = { night = 2800; day = 6500; }; brightness = { night = "0.5"; day = "1"; }; }; location = { latitude = 60.17; longitude = 24.94; }; }