anchor.diff:  , gst_all_1, startupnotification, gettext
   , perlPackages, libxml2, nss, nspr, farstream
   , libXScrnSaver, ncurses, avahi, dbus, dbus-glib, intltool, libidn
  -, lib, python, libICE, libXext, libSM
  +, lib, python3, libICE, libXext, libSM
   , cyrus_sasl ? null
   , openssl ? null
   , gnutls ? null
  
positive.code:   NIX_CFLAGS_COMPILE = "-I${gst_all_1.gst-plugins-base.dev}/include/gstreamer-1.0";
  
    buildInputs = let
      python-with-dbus = python.withPackages (pp: with pp; [ dbus-python ]);
    in [
      aspell startupnotification
      gst_all_1.gstreamer gst_all_1.gst-plugins-base gst_all_1.gst-plugins-good
  
negative.code: let unwrapped = stdenv.mkDerivation rec {
    pname = "pidgin";
    majorVersion = "2";
    version = "${majorVersion}.14.6";
  
    src = fetchurl {
      url = "mirror://sourceforge/pidgin/${pname}-${version}.tar.bz2";
      sha256 = "bb45f7c032f9efd6922a5dbf2840995775e5584771b23992d04f6eff7dff5336";
    };
  
    inherit nss ncurses;
  