ghc/cygwin filename resolution issue.

[Alex Ferguson]

Thanks to all for the replies;  Hal's resolution rings a bell, now that
I think about it, from Ye Olde Days when cygwin was a ghc pre-req -- just
didn't think of it when installing more recently on a new machine.  (Install
in haste, repent at leisure.)  Claus' suggestion about relative paths
does the ticket, though:  didn't occur to me as the paths were being
generated by a configure script, but yes, it was possible to override
them, which works as advertised.

Cheers,
Alex.