anchor.diff:  { lib
  +, attrs
   , buildPythonPackage
  +, cattrs
   , fetchFromGitHub
  -, poetry-core
  -, attrs
  -, cattrs
   , fonttools
   , fs
  +, importlib-metadata
  +, poetry-core
   , pytestCheckHook
  +, pythonOlder
   , ufo2ft
   , ufoLib2
   }:
  
positive.code:     fonttools
      # required by fonttools[ufo]
      fs
    ];
  
    checkInputs = [
  
negative.code: buildPythonPackage rec {
    pname = "statmake";
    version = "0.4.1";
    format = "pyproject";
  
    disabled = pythonOlder "3.7";
  
    src = fetchFromGitHub {
      owner = "daltonmaag";
      repo = pname;
      rev = "v${version}";
      sha256 = "sha256-OXhoQAD4LEh80iRUZE2z8sCtWJDv/bSo0bwHbOOPVE0=";
    };
  
    nativeBuildInputs = [
  