anchor.diff:      postFixup = ''
         makeWrapper $out/bin/nxplayer.bin $out/bin/nxplayer --set NX_SYSTEM $out/NX
         makeWrapper $out/bin/nxclient.bin $out/bin/nxclient --set NX_SYSTEM $out/NX
  +
  +      # libnxcau.so needs libpulse.so.0 for audio to work, but doesn't
  +      # have a DT_NEEDED entry for it.
  +      patchelf --add-needed libpulse.so.0 $out/NX/lib/libnxcau.so
       '';
     
       dontBuild = true;
  
positive.code:     '';
    
      nativeBuildInputs = [ file makeWrapper autoPatchelfHook ];
      buildInputs = [ jsoncpp ];
  
      installPhase = ''
        rm bin/nxplayer bin/nxclient
  
negative.code: { stdenv, lib, file, fetchurl, makeWrapper,
    autoPatchelfHook, jsoncpp, libpulseaudio }:
  let
    versionMajor = "6.4";
    versionMinor = "6_1";
  