anchor.diff:      for so in $out/lib/pulse-${pulseaudio.version}/modules/*.so; do
         orig_rpath=$(patchelf --print-rpath "$so")
         patchelf \
  -        --set-rpath "$orig_rpath:${lib.getLib ffmpeg_4}/lib:$out/lib/pulse-${pulseaudio.version}/modules" \
  +        --set-rpath "${lib.getLib ffmpeg_4}/lib:$out/lib/pulse-${pulseaudio.version}/modules:$orig_rpath" \
           "$so"
       done
     '';
  
positive.code: { stdenv
  , runCommand
  , fetchFromGitHub
  , libpulseaudio
  , pulseaudio
  , pkgconfig
  , ffmpeg_4
  
negative.code:   ];
  
    buildInputs = [
      pulseaudio
      ffmpeg_4
      libtool
  