anchor.diff:  assert xvidSupport -> xvidcore != null;
   
   stdenv.mkDerivation rec {
  -  name = "ffmpeg-0.7-rc1";
  +  name = "ffmpeg-0.8";
     
     src = fetchurl {
       url = "http://www.ffmpeg.org/releases/${name}.tar.bz2";
  -    sha256 = "07ma2b80nslwwy4ddfrz8k575dxyc8x9mvja55ghrwxys8lkhw2m";
  +    sha256 = "03zwwc1qs117pfjk9r071fbx4al3j0c85j97dgwqc0wp2z1zs9iy";
     };
     
     # `--enable-gpl' (as well as the `postproc' and `swscale') mean that
  
positive.code: , mp3Support ? true, lame ? null
  , speexSupport ? true, speex ? null
  , theoraSupport ? true, libtheora ? null
  , vorbisSupport ? true, libvorbis ? null
  , vpxSupport ? false, libvpx ? null
  , x264Support ? true, x264 ? null
  , xvidSupport ? true, xvidcore ? null
  , faacSupport ? false, faac ? null
  }:
  
  
negative.code:     ++ stdenv.lib.optional xvidSupport xvidcore
      ++ stdenv.lib.optional faacSupport faac;
  
    enableParallelBuilding = true;
      
    crossAttrs = {
      dontSetConfigureCross = true;
      configureFlags = configureFlags ++ [
  