anchor.diff:      ++ stdenv.lib.optional faacSupport "--enable-libfaac --enable-nonfree"
       ++ stdenv.lib.optional dc1394Support "--enable-libdc1394"
       ++ stdenv.lib.optional x11grabSupport "--enable-x11grab"
  -    ++ stdenv.lib.optional playSupport "--enable-ffplay";
  +    ++ stdenv.lib.optional playSupport "--enable-ffplay"
  +    ++ stdenv.lib.optional freetypeSupport "--enable-libfreetype";
   
     buildInputs = [ pkgconfig lame yasm zlib bzip2 alsaLib texinfo perl ]
       ++ stdenv.lib.optional mp3Support lame
  
positive.code:     ++ stdenv.lib.optional faacSupport faac
      ++ stdenv.lib.optional dc1394Support libdc1394
      ++ stdenv.lib.optionals x11grabSupport [ libXext libXfixes ]
      ++ stdenv.lib.optional playSupport SDL;
  
    enableParallelBuilding = true;
  
  
negative.code: assert faacSupport -> faac != null;
  assert x11grabSupport -> libXext != null && libXfixes != null;
  assert playSupport -> SDL != null;
  assert freetypeSupport -> freetype != null;
  
  stdenv.mkDerivation rec {
    name = "ffmpeg-1.2.3";
  