Installing a local copy of Validator

I'd like to install a local copy of Validator to be used for checking
web pages we must not make visible to the outside world. I'm quite
experienced at installing things with the minimum instructions - but I
prefer there to be more than the minimum! I've downloaded the source of
Validator, and read the README.cvs file that comes with it:

<p>
This is the code for the <a href="http://validator.w3.org/">W3C
HTML validation service</a>. For information on installing it,
please see the <a href="http://validator.w3.org/source/">source
code page</a>.
</p>

Unfortunately, the web page referred to does not contain any
installation instructions.

I then looked at the documents in the htdocs/docs directory of the
distribution, and the file devel.html there does contain some useful
information about which Perl modules are prerequisites for Validator.
One problem I always have, though, is relating the name of a Perl module
to the distribution .tar.gz file on CPAN which contains it. (Sometimes
it's obvious, other times a good guess is required.)

So, has anyone got any installation instructions for Validator? If no
one has, I'll do the necessary trial-and-error of installation and try
to write some myself.
-- 

John A. Murdie
Experimental Officer (Software)
Department of Computer Science
University of York
England