anchor.diff:  , poppler
   , popt
   , potrace
  -, python2
  +, python3
   , wrapGAppsHook
   , zlib
   }:
   let
  -  python2Env = python2.withPackages
  +  python3Env = python3.withPackages
       (ps: with ps; [
         numpy
         lxml
  
positive.code:     poppler
      popt
      potrace
      python2Env
      zlib
    ] ++ stdenv.lib.optionals (!stdenv.isDarwin) [
      gtkspell2
  
negative.code: in
  stdenv.mkDerivation rec {
    pname = "inkscape";
    version = "0.92.5";
  
    src = fetchurl {
      url = "https://media.inkscape.org/dl/resources/file/${pname}-${version}.tar.bz2";
      sha256 = "ge5/aeK9ZKlzQ9g5Wkp6eQWyG4YVZu1eXZF5F41Rmgs=";
    };
  
    # Inkscape hits the ARGMAX when linking on macOS. It appears to be
    # CMake’s ARGMAX check doesn’t offer enough padding for NIX_LDFLAGS.
  