anchor.diff:  , pytestCheckHook
   , pythonOlder
   , PCSC
  +, libiconv
   }:
   
   buildPythonPackage rec {
  
positive.code:   # for compatibility with maturin 0.9.0.
    postPatch = ''
      sed '/project-url = /d' -i Cargo.toml
    '';
  
    preCheck = ''
  
negative.code:   buildInputs = [
      pcsclite
      nettle
    ] ++ lib.optionals stdenv.isDarwin [
      PCSC
      libiconv
    ];
  
    # Needed b/c need to check AFTER python wheel is installed (using Rust Build, not buildPythonPackage)
    doCheck = false;
  