anchor.diff:    # Work around a bug in the CMake build:
     postInstall = ''
       chmod a+x $out/bin/*
  -    wrapProgram $out/bin/appleseed.studio --set PYTHONHOME ${python}
  +    wrapProgram $out/bin/appleseed.studio --set PYTHONHOME ${python3}
     '';
   }
   
  
positive.code:   };
    nativeBuildInputs = [ cmake pkg-config makeWrapper ];
    buildInputs = [
      boost_static guile eigen libpng python
      libGLU qt4 openexr openimageio opencolorio_1 xercesc
      osl seexpr
    ];
  
negative.code: { lib, stdenv, fetchFromGitHub, cmake, boost165, pkg-config, guile,
  eigen, libpng, python3, libGLU, qt4, openexr, openimageio,
  opencolorio_1, xercesc, ilmbase, osl, seexpr, makeWrapper
  }:
  
  let boost_static = boost165.override {
    enableStatic = true;
    enablePython = true;
    python = python3;
  };
  in stdenv.mkDerivation rec {
  
  