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:   buildInputs =
      [ SDL boost cmake ffmpeg gettext glew ilmbase libXi
        libjpeg libpng libsamplerate libsndfile libtiff mesa openal
        opencolorio openexr openimageio openjpeg python zlib fftw
      ] ++ optional jackaudioSupport jackaudio;
  
    postUnpack =
      ''
  