anchor.diff:        glib
         gobjectIntrospection
         gsettings_desktop_schemas
  +      gnome3.defaultIconTheme
  +      wrapGAppsHook
       ];
   
     configurePhase = ''
  
positive.code: { stdenv, fetchurl, pythonPackages, intltool, libxml2Python, curl, python
  , makeWrapper, virtinst, pyGtkGlade, pythonDBus, gnome_python, gtkvnc, vte
  , gtk3, gobjectIntrospection, libvirt-glib, gsettings_desktop_schemas, glib
  , avahi, dconf, spiceSupport ? true, spice_gtk, libosinfo
  }:
  
  with stdenv.lib;
  
negative.code:   buildPhase = "true";
  
    postInstall = ''
      ${glib}/bin/glib-compile-schemas "$out"/share/glib-2.0/schemas
    '';
  
  