anchor.diff:  
     inherit nss ncurses;
   
  +  nativeBuildInputs = [ makeWrapper ];
  +
     buildInputs = [
       gtkspell aspell
  -    gstreamer gst_plugins_base startupnotification
  +    gstreamer gst_plugins_base gst_plugins_good startupnotification
       libxml2 nss nspr farsight2
       libXScrnSaver ncurses python
       avahi dbus dbus_glib intltool libidn
  
positive.code: 
    enableParallelBuilding = true;
  
    meta = with stdenv.lib; {
      description = "Multi-protocol instant messaging client";
      homepage = http://pidgin.im;
  
negative.code: { stdenv, fetchurl, makeWrapper, pkgconfig, gtk, gtkspell, aspell
  , gstreamer, gst_plugins_base, gst_plugins_good, startupnotification, gettext
  , perl, perlXMLParser, libxml2, nss, nspr, farsight2
  , libXScrnSaver, ncurses, avahi, dbus, dbus_glib, intltool, libidn
  , lib, python, libICE, libXext, libSM
  