🚀 go-pugleaf

Mike Sommerville tells me that he was able to work around the problem
he had, where gnuchess would seem to hang after leaving its opening
book, by adding -DATTENTION to the DEFINES line in his xboard
Imakefile.  (Then, of course, typing "make Makefile; rm *.o; make".)

Mike is running on Solaris 2.1.  This symptom indicates that the
FIONREAD ioctl used in gnuchess to poll the keyboard for input is not
working on Mike's system; I still don't understand why.

Maybe the same thing would work for Dave Lewney on Solaris 2.2.

Maybe I should ship xboard with -DATTENTION defined by default.  I
think it is harmless even on systems that don't need it.  However, I'd
still like to know why FIONREAD isn't working on some systems.

	--Tim