anchor.diff:    cmakeFlags =
       [ "-DOPENEXR_INC=${openexr}/include/OpenEXR"
         "-DWITH_OPENCOLLADA=OFF"
  +      "-DWITH_MOD_OCEANSIM=ON"
         "-DWITH_CODEC_FFMPEG=ON"
         "-DWITH_CODEC_SNDFILE=ON"
         "-DWITH_INSTALL_PORTABLE=OFF"
  
positive.code:       "-DPYTHON_LIBPATH=${python}/lib"
        "-DPYTHON_INCLUDE_DIR=${python}/include/python${python.majorVersion}m"
        "-DPYTHON_VERSION=${python.majorVersion}"
      ] ++ stdenv.lib.optional jackaudioSupport "-DWITH_JACK=ON";
  
    NIX_CFLAGS_COMPILE = "-I${ilmbase}/include/OpenEXR -I${python}/include/${python.libPrefix}m";
  
  
negative.code: { stdenv, lib, fetchurl, SDL, boost, cmake, ffmpeg, gettext, glew
  , ilmbase, libXi, libjpeg, libpng, libsamplerate, libsndfile
  , libtiff, mesa, openal, opencolorio, openexr, openimageio, openjpeg, python
  , zlib, fftw
  , jackaudioSupport ? false, jackaudio
  }:
  
  with lib;
  
  stdenv.mkDerivation rec {
    name = "blender-2.71";
  