Undefined symbol in libXt.so.6.0

[Douglas Brebner <douglas%rsc.co.uk@localhost>]

Hi

I've just compiled Ghostscript 3.33 and xfmail 0.4, but when I run them I get
the error:
/usr/libexec/ld.so: undefined symbol "_SmcSaveYourselfDone" in
gs:/usr/local/X11R6.1/lib/libXt.so.6.0
xfmail give a similar error.
Can anyone tell me what's wrong and how to fix it? I'm using NetBSD1.2
Thanks in advance for any help.
-- 
Regards
Douglas

E-Mail:  douglas%rsc.co.uk@localhost
Fido:    2:259/26.27