inc core dumps on HP_UX

Hi nmh workers,

I have been atempting to install nmh on our HP machine (uname -a is:
        HP-UX comms4 B.10.20 B 9000/820)
but I keep getting a memory fault and core dump when I run the resulting inc 
command
(and various others like next and pref).  This happens with nmh versions
0.17, 0.26 and 0.27.   Curiously on an earlier system (uname is:
        HP-UX comms2 B.10.01 B 9000/887)
running nmh 0.17 I have no trouble.

I would appreciate any feedback on how to resolve this problem,

  Thanks in advance,

    Sandy

--   Dr Sandy Dance                              email: 
S(_dot_)Dance(_at_)bom(_dot_)gov(_dot_)au
     Bureau of Meteorology                   http://www.cs.mu.OZ.AU/~sandy
     150 Lonsdale St,         pgp: 90D6B191 finger 
sandy(_at_)munta(_dot_)cs(_dot_)mu(_dot_)OZ(_dot_)AU
     Melbourne, VIC 3000, Australia.  Wk +613 9669 4395 Fx: +613 9669 4128