anchor.diff: -{ stdenv, lib, buildPythonPackage, pythonOlder, pythonAtLeast
  +{ stdenv
  +, lib
  +, buildPythonPackage
  +, pythonOlder
  +, pythonAtLeast
   , fetchPypi
   , libmaxminddb
  -, ipaddress
   , mock
   , nose
   }:
   
   buildPythonPackage rec {
  +  pname = "maxminddb";
     version = "2.2.0";
  -  pname = "maxminddb";
     disabled = pythonOlder "3.6";
   
     src = fetchPypi {
  
positive.code: 
    buildInputs = [ libmaxminddb ];
  
    propagatedBuildInputs = [ ipaddress ];
  
    checkInputs = [ nose mock ];
  
    # Tests are broken for macOS on python38
  
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; [ ];
    };
  