anchor.diff:  }:
   
   stdenv.mkDerivation rec {
  -  name = "ModemManager-1.6.2";
  +  name = "ModemManager-1.6.6";
   
     src = fetchurl {
       url = "https://www.freedesktop.org/software/ModemManager/${name}.tar.xz";
  -    sha256 = "e4544398d9c166f8e13fe7c97149f262ad1fb48af980e0d4f9c34013920c6393";
  +    multihash = "QmUwz9xbS2LsCKmBWXrbjT1z4kZx9osqHfVYFFJ8hNN2Fk";
  +    sha256 = "b050aa0d9e0dd7cb2f22451efecfa2ac53b9a70d26da211b0e8bbc1ecba58a43";
     };
   
     nativeBuildInputs = [
  
positive.code:       $out/etc/systemd/system/dbus-org.freedesktop.ModemManager1.service
    '';
  
    meta = with stdenv.lib; {
      description = "WWAN modem manager, part of NetworkManager";
      homepage = https://www.freedesktop.org/wiki/Software/ModemManager/;
      license = licenses.gpl2;
  
negative.code: { stdenv
  , fetchurl
  , lib
  
  , glib
  , systemd_lib
  