anchor.diff:      libjpeg
       libtiff
       libwebp
  +    olefile
       openjpeg
       zlib
     ];
  
positive.code:   src = fetchPyPi {
      package = "Pillow";
      inherit version;
      sha256 = "0ee9975c05602e755ff5000232e0335ba30d507f6261922a658ee11b1cec36d1";
    };
  
    buildInputs = [
  
negative.code: { stdenv
  , buildPythonPackage
  , fetchPyPi
  , lib
  
  , freetype
  , lcms2
  , libjpeg
  , libtiff
  , libwebp
  , olefile
  , openjpeg
  , zlib
  }:
  
  let
    inherit (lib)
      optionals;
  
    version = "4.1.0";
  in
  buildPythonPackage rec {
    name = "pillow-${version}";
  