{ stdenv, buildPackages, fetchgit, perl, buildLinux, ... } @ args:

buildLinux (args // rec {
  version = "4.20.2019.02.20";
  modDirVersion = "4.20.0";

  src = fetchgit {
    url = "https://evilpiepirate.org/git/bcachefs.git";
    rev = "2d1aed5672ad55f86544cb5352560d5395012136";
    sha256 = "0b4swx0z36y4gglkjwxn3x1q0wknv4k2lbprhbing3ms0d45z9f2";
  };

  extraConfig = "BCACHEFS_FS m";

  extraMeta = {
    branch = "master";
    hydraPlatforms = []; # Should the testing kernels ever be built on Hydra?
    maintainers = with stdenv.lib.maintainers; [ davidak chiiruno ];
    platforms = [ "x86_64-linux" ];
  };

} // (args.argsOverride or {}))