anchor.diff:    # nixpkgs.
     buildInputs = [
       boost
  +    cereal
       curl
       expat
       glew
  
positive.code: { stdenv, lib, fetchFromGitHub, makeWrapper, cmake, pkgconfig
  , boost, curl, expat, glew, libpng, tbb, wxGTK30
  , gtest, nlopt, xorg, makeDesktopItem
  }:
  let
  
negative.code: in
  stdenv.mkDerivation rec {
    pname = "prusa-slicer";
    version = "2.1.0";
  
    enableParallelBuilding = true;
  
  