dia and gnome

[Zhang Linbo <zlb lsec cc ac cn>]

Without '--enble-gnome', I get the following error messages when
exiting from dia:

** (dia:7498): CRITICAL **: file app_procs.c: line 536 (app_exit):
assertion `!app_exit_once' failed

(dia:7498): Gtk-WARNING **: A floating object was finalized. This means
that someone
called g_object_unref() on an object that had only a floating
reference; the initial floating reference is not owned by anyone
and must be removed with gtk_object_sink() after a normal
reference is obtained with g_object_ref().

(dia:7498): Gtk-WARNING **: A floating object was finalized. This means
that someone
called g_object_unref() on an object that had only a floating
reference; the initial floating reference is not owned by anyone
and must be removed with gtk_object_sink() after a normal
reference is obtained with g_object_ref().

(dia:7498): Gtk-WARNING **: A floating object was finalized. This means
that someone
called g_object_unref() on an object that had only a floating
reference; the initial floating reference is not owned by anyone
and must be removed with gtk_object_sink() after a normal
reference is obtained with g_object_ref().