anchor.diff:         else
            "--disable-pthreads --disable-w32threads")
         (ifMinVer "0.9" "--disable-os2threads") # We don't support OS/2
  +      "--enable-network"
         (ifMinVer "2.4" "--enable-pixelutils")
       # Executables
         "--enable-ffmpeg"
  
positive.code:   nativeBuildInputs = [ perl pkgconfig texinfo yasm ];
  
    buildInputs = [
      bzip2 fontconfig freetype libiconv lame libass libogg libtheora libvdpau
      libvorbis lzma SDL soxr x264 xvidcore zlib
    ] ++ optional openglSupport mesa
      ++ optionals (!isDarwin) [ libvpx pulseaudio ] # Need to be fixed on Darwin
      ++ optional (isLinux || isFreeBSD) libva
  
negative.code: { stdenv, fetchurl, pkgconfig, perl, texinfo, yasm
  , alsaLib, bzip2, fontconfig, freetype, gnutls, libiconv, lame, libass, libogg
  , libtheora, libva, libvdpau, libvorbis, libvpx, lzma, pulseaudio, SDL, soxr
  , x264, xvidcore, zlib
  , openglSupport ? false, mesa ? null
  # Build options
  , runtimeCpuDetectBuild ? true # Detect CPU capabilities at runtime
  