nmh won't build on ULTRIX 4.2A because there's no mkstemp()

Howdy.  Is nmh supposed to build on ULTRIX?  I tried to install nmh 0.24 on
ULTRIX 4.2A, but it fails when it tries to link ali because sbr/snprintf.c
tries to call mkstemp(), which doesn't exist on this OS.

The man page for mkstemp() on HP-UX 10.20 says that mkstemp() is obsolete
and that tmpfile() should be used instead.  Does this sound right?  Should I 
patch 0.24 to call tmpfile() instead?

--
Dan Harkless
dharkless(_at_)unitech(_dot_)com
Unitech Research, Inc.