anchor.diff:  { stdenv
   , buildPythonPackage
   , fetchPyPi
  +, lib
   
   , freetype
   , lcms2
   , libjpeg
   , libtiff
   , libwebp
  +, olefile
   , openjpeg
   , zlib
   }:
   
   let
  -  inherit (stdenv.lib)
  +  inherit (lib)
       optionals;
   
  -  version = "3.4.2";
  +  version = "4.1.0";
   in
   buildPythonPackage rec {
     name = "pillow-${version}";
  
positive.code:     libjpeg
      libtiff
      libwebp
      openjpeg
      zlib
    ];
  
negative.code:     export LDFLAGS="$(echo "$NIX_LDFLAGS" | sed 's,-rpath [^ ]*,,g')"
    '';
  
    meta = with lib; {
      description = "Fork of The Python Imaging Library (PIL)";
      homepage = http://python-pillow.org/;
      license = licenses.free; # PIL license
  