python3Packages.pyads: fix build failure

{

  lib,

  stdenv,

  adslib,

  buildPythonPackage,

  fetchFromGitHub,

  buildInputs = [ adslib ];

  patchPhase = ''

    substituteInPlace pyads/pyads_ex.py \

      --replace-fail "ctypes.CDLL(adslib)" "ctypes.CDLL(\"${adslib}/lib/adslib.so\")"

  postPatch = ''

    # Skip compilation of bundled adslib - we provide it as a separate nix package

    substituteInPlace setup.py \

      --replace-fail \

        'return sys.platform.startswith("linux") or sys.platform.startswith("darwin")' \

        'return False'

    # Load adslib from nix store instead of searching sys.path

    substituteInPlace src/pyads/pyads_ex.py \

      --replace-fail \

        'ctypes.CDLL(adslib_path)' \

        'ctypes.CDLL("${lib.getLib adslib}/lib/adslib.so")'

  '';

  nativeCheckInputs = [ pytestCheckHook ];

  # Test suite has port reuse races and UDP timing issues on darwin

  doCheck = !stdenv.hostPlatform.isDarwin;

  pythonImportsCheck = [ "pyads" ];

  meta = {