If you look at the ebuild there is an IUSE entry.  You can also use equery 
uses package name to see what it uses.

On Sunday February 26 2006 21:40, Ryan Tandy wrote:
> Brett I. Holcomb wrote:
> > They come from /etc/make.conf or /etc/portage/package.use.  The profile
> > you are using has defaults set.
> >
> > On Sunday February 26 2006 21:00, Bo Andresen wrote:
> >> I decided I wanted to remove the ipv6 use flag which I have had enabled

snip

> >>
> >> --
> >> Bo Andresen
>
> I think what the OP is asking, is where the usability of the flags is
> specified in the Firefox ebuild(s) - which it quite clearly isn't.  If
> this is the case, I think the ipv6 USE-flag is added by an inherited
> eclass (assuming they can do that) - probably one of the mozilla ones.

-- 

Brett I. Holcomb
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