{ final, prev, sources, ... }: {
  etesync-dav = let
    python = final.python3.override {
      packageOverrides = self: super: {
        # flask-wtf = super.flask-wtf.overridePythonAttrs (old: rec {
        #   patches = [];
        #   version = "0.15.1";
        #   src = old.src.override {
        #     inherit version;
        #     sha256 = "ff177185f891302dc253437fe63081e7a46a4e99aca61dfe086fb23e54fff2dc";
        #   };
        #   disabledTests = [
        #     "test_outside_request"
        #   ];
        # });
        # wtforms = super.wtforms.overridePythonAttrs (old: rec {
        #   version = "2.3.3";
        #   src = old.src.override {
        #     inherit version;
        #     sha256 = "81195de0ac94fbc8368abbaf9197b88c4f3ffd6c2719b5bf5fc9da744f3d829c";
        #   };
        #   checkPhase = ''
        #     ${self.python.interpreter} tests/runtests.py
        #   '';
        # });
        etebase = super.wtforms.overridePythonAttrs (old: rec {
          inherit (sources.etebase-py) version src;
        });
      };
    };
  in python.pkgs.buildPythonApplication rec {
    pname = "etesync-dav";
    version = "0.32.1";

    src = python.pkgs.fetchPypi {
      inherit pname version;
      sha256 = "a4e2ee83932755d29ac39c1e74005ec289880fd2d4d2164f09fe2464a294d720";
    };

    propagatedBuildInputs = with python.pkgs; [
      appdirs
      etebase
      etesync
      flask
      flask-wtf
      msgpack
      pysocks
      (python.pkgs.toPythonModule (final.radicale3.override { python3 = python; }))
      requests
    ] ++ requests.optional-dependencies.socks;

    doCheck = false;

    meta = with final.lib; {
      homepage = "https://www.etesync.com/";
      description = "Secure, end-to-end encrypted, and privacy respecting sync for contacts, calendars and tasks";
      license = licenses.gpl3;
      broken = final.stdenv.isDarwin; # pyobjc-framework-Cocoa is missing
    };
  };
}