Rev 1.17 of lib/libc/regex/regcomp.c fixes the problem for me.  I'm
requesting a pull-up to the 1.5 branch and will close the PR when this
is done.

As to why others can't reproduct it ... that'll remain a mystery...

Simon.
--
Simon Burge                            <simonb@wasabisystems.com>
NetBSD CDs, Support and Service:    http://www.wasabisystems.com/