alex dependency in cvs

[Simon Marlow]

> It would be good to have the configure script fail (or at least give a
> warning--saying it's not found doesn't tell me that it is 
> needed) if alex isn't present.

Thanks, I forgot to do that.  Fixed now.

> Also, it would be nice to update the web page to use the CVS 
> version of the
> "CVS cheatsheet", since the one that is available online 
> makes no mention
> of alex, either as an available CVS module or as a build dependency.

Yes, we should have the CVS versions of the build documentation online
somewhere (although perhaps not in the default places, because those
will be used by people trying to build the released version).  It's on
my todo list.

Cheers,
	Simon