anchor.diff:  { lib
  +, backoff
   , buildPythonPackage
   , fetchFromGitHub
   , pythonOlder
  
positive.code:     owner = "Cereal2nd";
      repo = pname;
      rev = version;
      sha256 = "sha256-WywJ70tVniUX9RZTh9aswHgCEvWTggzABhSWoSRydUc=";
    };
  
    propagatedBuildInputs = [
      pyserial-asyncio
    ];
  
  
negative.code:     pytestCheckHook
    ];
  
    pythonImportsCheck = [
      "velbusaio"
    ];
  
    meta = with lib; {
      description = "Python library to support the Velbus home automation system";
  