anchor.diff:    configureFlags = [
       "--disable-maintainer-mode"
       "--enable-udev"
  +    "--disable-usbdk"
       #"--enable-timerfd"
       "--enable-log"
       "--disable-debug-log"
  
positive.code: let
    inherit (stdenv.lib)
      optional;
  in
  
  stdenv.mkDerivation rec {
    name = "libusb-1.0.20";
  
    src = fetchurl {
      url = "mirror://sourceforge/libusb/libusb-1.0/${name}/${name}.tar.bz2";
      multihash = "QmVhJXs3ZHHguFH9KbQuFNPeN4sePqMB6BUmgBQUHWZnWp";
      sha256 = "1zzp6hc7r7m3gl6zjbmzn92zkih4664cckaf49l1g5hapa8721fb";
    };
  
    buildInputs = [
  
negative.code:     "-lgcc_s"
    ];
  
    meta = with stdenv.lib; {
      description = "Userspace access to USB devices";
      homepage = http://www.libusb.info;
  