anchor.diff: -{ lib, python3, fetchFromGitHub }:
  +{ lib, python3, fetchFromGitHub, withServer ? false }:
   
   let
     python3' = python3.override {
  
positive.code:       --replace "self.assertEqual(url, \"https://www.google.com\")" ""
      substituteInPlace setup.py \
        --replace mypy-extensions==0.4.1 mypy-extensions>=0.4.1
    '';
  
    postInstall = ''
  
negative.code:       });
      };
    };
    serverRequire = with python3'.pkgs; [
      requests
      flask
      flask-admin
      flask-api
      flask-bootstrap
      flask-paginate
      flask-reverse-proxy-fix
      flask_wtf
      arrow
      werkzeug
      click
      vcrpy
      toml
    ];
  in
  with python3'.pkgs; buildPythonApplication rec {
    version = "4.6";
  