anchor.diff:  
     buildInputs = [ libmaxminddb ];
   
  -  propagatedBuildInputs = [ ipaddress ];
  -
     checkInputs = [ nose mock ];
   
     # Tests are broken for macOS on python38
  
positive.code: { stdenv, lib, buildPythonPackage, pythonOlder, pythonAtLeast
  , fetchPypi
  , libmaxminddb
  , ipaddress
  , mock
  , nose
  }:
  
  buildPythonPackage rec {
    version = "2.2.0";
    pname = "maxminddb";
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
  
negative.code: 
    meta = with lib; {
      description = "Reader for the MaxMind DB format";
      homepage = "https://github.com/maxmind/MaxMind-DB-Reader-python";
      license = licenses.asl20;
      maintainers = with maintainers; [ ];
    };
  