🚀 go-pugleaf

Hello,

I am trying to run gnuchess (5.02) with xboard (4.26) and have the 
following problem:   

I type 'xboard -fcp gnuchess'

I can make one move, then the program makes one move.
After that the program crashes with Fatal Errors:

'Error: First chess program (gnuchess) exited unexpectedly'
and
'Error writing to first chess program: Broken pipe.'

I am running on a SunOS  5.6 Generic_105181-28 sun4u sparc SUNW,Ultra-4.

I had one possible problem that happened during the set up of gnuchess. 
Everything compiled properly. But when I got to the part of the
INSTALL that recommends

ln -s ../book/book.pgn
./gnuchess
book create book.pgn
quit

Nothing happened.  I don't know if this is related to the problem I see.
I am very grateful for any advice you can provide.