anchor.diff:  
     propagatedBuildInputs = [
       cffi
  -    six
     ];
   
     checkInputs = [
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , pytestCheckHook
  
negative.code: , libsodium
  , cffi
  , hypothesis
  }:
  
  buildPythonPackage rec {
    pname = "pynacl";
    version = "1.5.0";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
  