anchor.diff:  , werkzeug
   , wtforms
   , psycopg2 # optional, for postgresql support
  -, flask_testing
  +, flask-testing
   , pytestCheckHook
   , fetchpatch
   }:
  
positive.code: { buildPythonPackage
  , lib
  , isPy27
  , nixosTests
  , fetchPypi
  
negative.code:     homepage = "https://ihatemoney.org";
      description = "A simple shared budget manager web application";
      license = licenses.beerware;
      maintainers = with maintainers; [ symphorien ];
    };
  }
  