{
  lib,
  gitSource,

  buildDunePackage,
  cstruct,
  dune-configurator,
  eio,
  eio_linux,
  eio_main,
  ppx_unicode,
  ptime,
  xlog,

  ocaml,
  dune_3,
  odoc,
  utop,

  withShell ? false
}:
buildDunePackage rec {
  pname = "systemd";
  version = "0.0.1";
  src = gitSource { root = ./.; };

  minimalOCamlVersion = "5.1";
  dontStrip = true;

  buildInputs = [
    ppx_unicode
    xlog
    ptime
    dune-configurator
    cstruct
    eio
    eio_main
    eio_linux
  ] ++ lib.optionals withShell [ utop ];
  nativeBuildInputs = [ ppx_unicode dune-configurator ] ++ lib.optionals withShell [
    ocaml dune_3 odoc utop
  ];
}