CFD: update to Porter's Handbook to document build Makevars

[Mark Linimon]

On Mon, 13 Dec 2004, Simon L. Nielsen wrote:

> I would suggest:
> 
> 	  in <xref linkend="dads-noinstall">.</para>

I never remember that one.

> > +	    <programlisting>NOT_FOR_ARCHS = alpha ia64 sparc64</programlisting>
> 
> Isn't there normally no space between the variable name and the equal
> character in the ports Makefiles?

Yes, and I'll go fix the cases where it's already wrong elsewhere.  Sigh.

> > +      <sect1 id="FreshPorts">
> 
> Was it intentionally that you used capital letters here?

That's how he styles it, but I can lowercase it if that's right.

I'll incorporate all the others.

mcl