{
  lib,
  stdenv,
  fetchFromGitLab,
  callPackage,

  cmake,
  ninja,
  mbedtls,
  libxcrypt,
  zlib,

  enableCache ? true, # Internal cache support.
  enableIpV6 ? true,
  enableTls ? true,
  enableMonitor ? false, # Support for the Hiawatha Monitor.
  enableRproxy ? true, # Reverse proxy support.
  enableTomahawk ? false, # Tomahawk, the Hiawatha command shell.
  enableXslt ? true,
  libxml2 ? null,
  libxslt ? null,
  enableToolkit ? true, # The URL Toolkit.
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "hiawatha";
  version = "11.6";

  src = fetchFromGitLab {
    owner = "hsleisink";
    repo = "hiawatha";
    rev = "v${finalAttrs.version}";
    hash = "sha256-YsZdVqanVNibA4KnAknLh61hVo7x5uu67lb+RX2N7c8=";
  };

  nativeBuildInputs = [
    cmake
    ninja
  ];
  buildInputs =
    [
      mbedtls
      libxcrypt
      zlib
    ]
    ++ lib.optionals enableXslt [
      libxslt
      libxml2
    ];

  prePatch = ''
    substituteInPlace CMakeLists.txt --replace SETUID ""
  '';

  cmakeFlags = [
    "-DUSE_SYSTEM_MBEDTLS=on" # Policy to use Nix deps, and Nix uses up to date deps
    (if enableCache then "-DENABLE_CACHE=on" else "-DENABLE_CACHE=off")
    (if enableIpV6 then "-DENABLE_IPV6=on" else "-DENABLE_IPV6=off")
    (if enableTls then "-DENABLE_TLS=on" else "-DENABLE_TLS=off")
    (if enableMonitor then "-DENABLE_MONITOR=on" else "-DENABLE_MONITOR=off")
    (if enableRproxy then "-DENABLE_RPROXY=on" else "-DENABLE_RPROXY=off")
    (if enableTomahawk then "-DENABLE_TOMAHAWK=on" else "-DENABLE_TOMAHAWK=off")
    (if enableXslt then "-DENABLE_XSLT=on" else "-DENABLE_XSLT=off")
    (if enableToolkit then "-DENABLE_TOOLKIT=on" else "-DENABLE_TOOLKIT=off")
  ];

  passthru.tests.serve-static-files = callPackage ./test.nix {
    hiawatha = finalAttrs.finalPackage;
    inherit enableTls;
  };

  meta = with lib; {
    homepage = "https://hiawatha.leisink.net/";
    description = "Advanced and secure webserver";
    license = licenses.gpl2Only;
    platforms = platforms.unix; # "Hiawatha runs perfectly on Linux, BSD and MacOS X"
    mainProgram = "hiawatha";
    maintainers = [ ];
  };

})