anchor.diff:  
   buildPythonPackage rec {
     pname = "seaborn";
  -  version = "0.11.2";
  -  format = "setuptools";
  +  version = "0.12.0";
  +  format = "pyproject";
   
     disabled = pythonOlder "3.6";
   
  -  src = fetchPypi {
  -    inherit pname version;
  -    sha256 = "cf45e9286d40826864be0e3c066f98536982baf701a7caa386511792d61ff4f6";
  +  src = fetchFromGitHub {
  +    repo = "seaborn";
  +    owner = "mwaskom";
  +    rev = "v${version}";
  +    sha256 = "sha256-rJQRsUYFF0LoksE+q+CbxAxdI/Pi9k1qWR2G3PD1MkI=";
     };
  +
  +  nativeBuildInputs = [ flit-core ];
   
     propagatedBuildInputs = [
       matplotlib
  
positive.code: { lib
  , stdenv
  , buildPythonPackage
  , fetchPypi
  , matplotlib
  , pytestCheckHook
  , numpy
  
negative.code:   ];
  
    meta = with lib; {
      description = "Statistical data visualization";
      homepage = "https://seaborn.pydata.org/";
      license = with licenses; [ bsd3 ];
      maintainers = with maintainers; [ fridh ];
  