anchor.diff:  
   buildPythonPackage rec {
     pname = "lxml";
  -  version = "4.5.0";
  +  version = "4.5.2";
   
     src = fetchFromGitHub {
       owner = pname;
       repo = pname;
       rev = "${pname}-${version}";
  -    sha256 = "1i3bhg8xb502afq4ar3kgvvi1hy83l4af2gznfwqvb5b221fr7ak";
  +    sha256 = "1d0cpwdjxfzwjzmnz066ibzicyj2vhx15qxmm775l8hxqi65xps4";
     };
   
     # setuptoolsBuildPhase needs dependencies to be passed through nativeBuildInputs
  
positive.code: { stdenv, buildPythonPackage, fetchFromGitHub
  , cython
  , libxml2
  , libxslt
  
negative.code: 
    pythonImportsCheck = [ "lxml" "lxml.etree" ];
  
    meta = with lib; {
      description = "Pythonic binding for the libxml2 and libxslt libraries";
      homepage = "https://lxml.de";
      license = licenses.bsd3;
  