I see many "Locale not supported by C library" warnings. Seems following
peace of code in libgnomeui/gnome-ui-init.c in libgnomeui_pre_args_parse
causes them.

---code---
        /* Begin hack to propogate an en_US locale into Gtk+ if LC_CTYPE=C,
so that non-ASCII
           characters will display for as many people as possible. Related
to bug #1979 */
        ctype = setlocale (LC_CTYPE, "");
	g_print("Ctype: %s\n", ctype);

        if (strcmp (ctype, "C") == 0) {
                old_ctype = g_strdup (g_getenv ("LC_CTYPE"));
                gnome_setenv ("LC_CTYPE", "en_US", TRUE);
                ctype_set = TRUE;
        } else {
                ctype_set = FALSE;
	}

        gtk_set_locale ();

        if (ctype_set) {
                if (old_ctype) {
			gnome_setenv ("LC_CTYPE", old_ctype, TRUE);
                        g_free (old_ctype);
                } else {
			gnome_unsetenv ("LC_CTYPE");
		}
        }
        /* End hack */
---code---

On my machine with properly set locale (LANG=ru_RU.KOI8-R) call to
setlocale(LC_CTYPE, NULL) sets ctype variable to C and hack always run.
After call to gtk_set_locale() locale becomes C too.
According to man it's necessary to initialize locale first with call to
setlocale(XXX,"").
There are two possibilities to do so
1. Change ctype=setlocale(LC_CTYPE, NULL) to setlocale(LC_CTYPE,""). I've
made such modification and all warnigs gone.
2. Place gtk_set_locale() before begin of the hack.