anchor.diff:    ]
       ++ libintlOrEmpty
       ++ optional faacSupport faac
  +    # for gtksink
  +    ++ optional gtkSupport gtk3
       ++ optional stdenv.isLinux wayland
       # wildmidi requires apple's OpenAL
       # TODO: package apple's OpenAL, fix wildmidi, include on Darwin
  
positive.code: 
    buildInputs = [
      gst-plugins-base orc
      faad2 libass libkate libmms
      libmodplug mpeg2dec mpg123
      openjpeg libopus librsvg
      fluidsynth libvdpau
  
negative.code: { stdenv, fetchurl, pkgconfig, python, gst-plugins-base, orc
  , faacSupport ? false, faac ? null
  , gtkSupport ? false, gtk3 ? null
  , faad2, libass, libkate, libmms
  , libmodplug, mpeg2dec, mpg123
  , openjpeg, libopus, librsvg
  