Re: added list of prereqs to README

[Ben Pfaff]

John Darrington <address@hidden> writes:

> There was a discussion on one of the GNU mailing lists a few months
> ago.  I forget the details, but the concensus was that configure
> scripts should arranged such that if *any* of the prerequisites are
> not found by configure, then they should *all* be reported together,
> on the first attempt to run ./configure.
>
> I don't think we do this.  Perhaps we should.

I have now implemented this suggestion and checked it in.
It was easier to do so than I expected.

It would be a good idea to make the GUI libraries a set of
optional functionality that we report via this mechanism, but I
didn't actually do that.

I also cleaned up the rest of configure.ac somewhat.
-- 
"doe not call up Any that you can not put downe."
--H. P. Lovecraft