anchor.diff:  }:
   
   let
  -  # gst-transcoder will eventually be merged with gstreamer (according to
  -  # gst-transcoder 1.8.0 release notes). For now the only user is pitivi so we
  -  # don't bother exposing the package to all of nixpkgs.
  +  # gst-transcoder was merged with gst-plugins-bad 1.18.
  +  # TODO: switch to that once available.
     gst-transcoder = stdenv.mkDerivation rec {
       version = "1.14.1";
       pname = "gst-transcoder";
  
positive.code: { stdenv
  , fetchFromGitHub
  , fetchurl
  , pkg-config
  , intltool
  , itstool
  , python3
  , wrapGAppsHook
  
negative.code: 
    postPatch = ''
      patchShebangs ./getenvvar.py
  
      # fetchpatch does not support renamings
      mv data/org.pitivi.Pitivi-mime.xml data/org.pitivi.Pitivi-mime.xml.in
    '';
  
    passthru = {
  