anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "nautilus";
  -  version = "42.2";
  +  version = "43.alpha";
   
     outputs = [ "out" "dev" ];
   
     src = fetchurl {
       url = "mirror://gnome/sources/${pname}/${lib.versions.major version}/${pname}-${version}.tar.xz";
  -    sha256 = "mSEtLrdZlvGBcorQSi4thvJXewZOaKNMi4GnA330zLI=";
  +    sha256 = "hjVoot3dHPgTNmbDe4Cwf4AN6Wbomh0l4QM0mP+iw5k=";
     };
   
     patches = [
  
positive.code:     meson
      ninja
      pkg-config
      python3
      wrapGAppsHook
    ];
  
    buildInputs = [
  
negative.code:       --prefix XDG_DATA_DIRS : "${librsvg}/share"
        --prefix XDG_DATA_DIRS : "${shared-mime-info}/share"
      )
    '';
  
    passthru = {
  