anchor.diff:  }:
   
   assert gtkSupport -> gtk3 != null;
  +assert raspiCameraSupport -> ((libraspberrypi != null) && stdenv.isLinux && stdenv.isAarch64);
   
   let
     inherit (stdenv.lib) optionals;
  
positive.code:     xorg.libXfixes
      xorg.libXdamage
      wavpack
    ] ++ optionals gtkSupport [
      # for gtksink
      gtk3
  
negative.code: , mpg123
  , twolame
  , gtkSupport ? false, gtk3 ? null
  , raspiCameraSupport ? false, libraspberrypi ? null
  , enableJack ? true, libjack2
  , libXdamage
  , libXext
  