XEmacs: How to suppress a warning

[a at zeos.net]

I set
LC_CTYPE=ru_RU.CP866

Every time I start
XEmacs 21.5  (beta27) "fiddleheads" [Lucid] (i386--freebsd, Mule)
it reads me in a separate buffer:

(1) (xintl/warning) System supports locale `' but X Windows does not

But I do not need this notification 30 times a day.

How to prevent this warning?

Elisej Babenko