anchor.diff:        (ifMinVer "0.6" "--disable-doc")
       # External Libraries
         "--enable-bzlib"
  +      "--enable-gnutls"
         (ifMinVer "1.0" "--enable-fontconfig")
         (ifMinVer "0.7" "--enable-libfreetype")
         "--enable-libmp3lame"
  
positive.code: { stdenv, fetchurl, pkgconfig, perl, texinfo, yasm
  , alsaLib, bzip2, fontconfig, freetype, 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
  
negative.code:        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"
  