anchor.diff: -{ stdenv, python3Packages, fetchpatch, glibcLocales, rustPlatform, pkgconfig, openssl, Security }:
  +{ stdenv, python3Packages, fetchFromGitHub, fetchpatch, glibcLocales, rustPlatform, pkgconfig, openssl, Security }:
   
   # Packaging documentation at:
   # https://github.com/untitaker/vdirsyncer/blob/master/docs/packaging.rst
  -let
  -  pythonPackages = python3Packages;
  -  version = "0.17.0a3";
  +python3Packages.buildPythonApplication rec {
  +  version = "unstable-2018-08-05";
     pname = "vdirsyncer";
  -  name = pname + "-" + version;
  -  src = pythonPackages.fetchPypi {
  -    inherit pname version;
  -    sha256 = "1n7izfa5x9mh0b4zp20gd8qxfcca5wpjh834bsbi5pk6zam5pfdy";
  +  name = "${pname}-${version}";
  +
  +  src = fetchFromGitHub {
  +    owner = "pimutils";
  +    repo = pname;
  +    rev = "ac45cf144b0ceb72cc2a9f454808688f3ac9ba4f";
  +    sha256 = "0hqsjdpgvm7d34q5b2hzmrzfxk43ald1bx22mvgg559kw1ck54s9";
     };
  +
     native = rustPlatform.buildRustPackage {
  -    name = name + "-native";
  +    name = "${name}-native";
       inherit src;
  -    sourceRoot = name + "/rust";
  -    cargoSha256 = "08xq9q5fx37azzkqqgwcnds1yd8687gh26dsl3ivql5h13fa2w3q";
  +    sourceRoot = "source/rust";
  +    cargoSha256 = "02fxxw4vr6rpdbslrc9c1zhzs704bw7i40akrmh5cxl26rsffdgk";
       buildInputs = [ pkgconfig openssl ] ++ stdenv.lib.optional stdenv.isDarwin Security;
     };
  -in pythonPackages.buildPythonApplication rec {
  -  inherit version pname src native;
   
  -  propagatedBuildInputs = with pythonPackages; [
  +  propagatedBuildInputs = with python3Packages; [
       click click-log click-threading
       requests_toolbelt
       requests
  
positive.code: 
    checkPhase = ''
      rm -rf vdirsyncer
      export PYTHONPATH=$out/${pythonPackages.python.sitePackages}:$PYTHONPATH
      make DETERMINISTIC_TESTS=true test
    '';
  
  
negative.code:     shippai
    ];
  
    buildInputs = with python3Packages; [ setuptools_scm ];
  
    checkInputs = with python3Packages; [ hypothesis pytest pytest-localserver pytest-subtesthack ] ++ [ glibcLocales ];
  
    patches = [
      # Fixes for hypothesis: https://github.com/pimutils/vdirsyncer/pull/779
      (fetchpatch {
        url = https://github.com/pimutils/vdirsyncer/commit/22ad88a6b18b0979c5d1f1d610c1d2f8f87f4b89.patch;
        sha256 = "0dbzj6jlxhdidnm3i21a758z83sdiwzhpd45pbkhycfhgmqmhjpl";
  