anchor.diff:  
   buildPythonPackage rec {
     pname = "flask-appbuilder";
  -  version = "3.4.4";
  +  version = "4.0.0";
     format = "setuptools";
   
     disabled = pythonOlder "3.7";
  
positive.code:   postPatch = ''
      substituteInPlace setup.py \
        --replace "apispec[yaml]>=3.3, <4" "apispec[yaml] >=3.3" \
        --replace "Flask>=0.12, <2" "Flask" \
        --replace "Flask-Login>=0.3, <0.5" "Flask-Login >=0.3, <0.6" \
        --replace "Flask-Babel>=1, <2" "Flask-Babel >=1, <3" \
        --replace "Flask-WTF>=0.14.2, <0.15.0" "Flask-WTF" \
        --replace "WTForms<3.0.0" "WTForms" \
        --replace "marshmallow-sqlalchemy>=0.22.0, <0.27.0" "marshmallow-sqlalchemy" \
        --replace "Flask-JWT-Extended>=3.18, <4" "Flask-JWT-Extended>=4.1.0" \
        --replace "PyJWT>=1.7.1, <2.0.0" "PyJWT>=2.0.1" \
        --replace "prison>=0.2.1, <1.0.0" "prison" \
        --replace "SQLAlchemy<1.4.0" "SQLAlchemy"
    '';
  
    # Majority of tests require network access or mongo
  
negative.code:   src = fetchPypi {
      pname = "Flask-AppBuilder";
      inherit version;
      hash = "sha256-g+iHUL83PokXPGu7HJ8ffLocQr0uGpMqS5MbfIlZZ2E=";
    };
  
    patches = [
      (fetchpatch {
        # https://github.com/dpgaspar/Flask-AppBuilder/pull/1734
        name = "flask-appbuilder-wtf3.patch";
  