FreeBSD recently imported a pathchk(1), so I've nabbed it and tidied and
packaged at http://www.perkin.org.uk/projects/netbsd/pathchk.tar.gz

The only thing I'm unsure of is that the spec says that a diagnostic
will be written out for *each* component which fails <x> check, but both
FreeBSD and GNU versions bail out on the first failure.  Maybe I'm
reading it wrong...

Enjoy,

-- 
Jonathan Perkin - Internet Operations Engineer - BBC Internet Services
24x7 Hotline: +44 (0)1628 407 777 (x37777) - http://support.bbc.co.uk/