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