Log Message:
Increase default stack limit.  This gets around a problem where the
standalone guile program fails to run (with a guile stack overflow)
on at least NetBSD-5.1/alpha.
http://lists.gnu.org/archive/html/guile-user/2009-12/msg00019.html
and
http://lists.gnu.org/archive/html/guile-devel/2009-03/msg00114.html
show that others have had problems here.