anchor.diff:  
     buildInputs = [
       alsaLib
  -
  -    xorg.libX11
  -    xorg.libXi
  -
  -    gdk-pixbuf
  -    pango
  -    cairo
  -    glib
  -    freetype
  -
  -    xdg_utils
  +    stdenv.cc.cc.lib # reaper and libSwell need libstdc++.so.6
  +    gtk3
     ];
   
     runtimeDependencies = [
  -    gtk3
  -  ];
  +    gtk3 # libSwell needs libgdk-3.so.0
  +  ]
  +  ++ lib.optional jackSupport libjack2
  +  ++ lib.optional pulseaudioSupport libpulseaudio;
   
     dontBuild = true;
   
  
positive.code: { lib, stdenv, fetchurl, autoPatchelfHook, makeWrapper
  , alsaLib, xorg, libjack2
  , gtk3, pango, gdk-pixbuf, cairo, glib, freetype
  , libpulseaudio, xdg_utils
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:       --integrate-user-desktop
      rm $out/opt/REAPER/uninstall-reaper.sh
  
      # Dynamic loading of plugin dependencies does not adhere to rpath of
      # reaper executable that gets modified with runtimeDependencies.
      # Patching each plugin with DT_NEEDED is cumbersome and requires
      # hardcoding of API versions of each dependency.
      # Setting the rpath of the plugin shared object files does not
      # seem to have an effect for some plugins.
      # We opt for wrapping the executable with LD_LIBRARY_PATH prefix.
      wrapProgram $out/opt/REAPER/reaper \
        --prefix LD_LIBRARY_PATH : "${lib.makeLibraryPath [ lame ffmpeg vlc ]}"
  
      mkdir $out/bin
      ln -s $out/opt/REAPER/reaper $out/bin/
  