anchor.diff:      sha256 = "1rgkijn1nirj3jwh058zv6piw8q4j5wwjapgbvh2hh6fpbj84bgb";
     };
   
  -  buildInputs = [
  -    SDL boost cmake ffmpeg gettext glew ilmbase jackaudio libXi
  -    libjpeg libpng libsamplerate libsndfile libtiff mesa openal
  -    opencolorio openexr openimageio openjpeg python zlib
  -  ];
  +  buildInputs =
  +    [ SDL boost cmake ffmpeg gettext glew ilmbase jackaudio libXi
  +      libjpeg libpng libsamplerate libsndfile libtiff mesa openal
  +      opencolorio openexr openimageio openjpeg python zlib
  +    ] ++ stdenv.lib.optional jackaudioSupport jackaudio;
   
  -
  -  cmakeFlags = [
  -    "-DOPENEXR_INC=${openexr}/include/OpenEXR"
  -    "-DWITH_OPENCOLLADA=OFF"
  -    "-DWITH_CODEC_FFMPEG=ON"
  -    "-DWITH_CODEC_SNDFILE=ON"
  -    "-DWITH_JACK=ON"
  -    "-DWITH_INSTALL_PORTABLE=OFF"
  -    "-DPYTHON_LIBRARY=python${python.majorVersion}m"    
  -    "-DPYTHON_LIBPATH=${python}/lib"
  -    "-DPYTHON_INCLUDE_DIR=${python}/include/python${python.majorVersion}m"
  -    "-DPYTHON_VERSION=${python.majorVersion}"
  -  ];
  +  cmakeFlags =
  +    [ "-DOPENEXR_INC=${openexr}/include/OpenEXR"
  +      "-DWITH_OPENCOLLADA=OFF"
  +      "-DWITH_CODEC_FFMPEG=ON"
  +      "-DWITH_CODEC_SNDFILE=ON"
  +      "-DWITH_INSTALL_PORTABLE=OFF"
  +      "-DPYTHON_LIBRARY=python${python.majorVersion}m"
  +      "-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";
   
  
positive.code: { stdenv, fetchurl, SDL, boost, cmake, ffmpeg, gettext, glew
  , ilmbase, jackaudio, libXi, libjpeg, libpng, libsamplerate, libsndfile
  , libtiff, mesa, openal, opencolorio, openexr, openimageio, openjpeg, python
  , zlib
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:     license = licenses.gpl2Plus;
      platforms = platforms.linux;
      maintainers = [ maintainers.goibhniu ];
    };
  }
  