Zac Medico posted on Tue, 06 Dec 2011 15:45:26 -0800 as excerpted:

> We can easily roll packages.default into the set support that's in
> stable portage (no need for full-blown sets.conf support). Currently, in
> stable portage, we have:
> 
>   @world = @selected + @system
> 
> How about if we add an optional @default set that's generated from
> pacakges.default in the user's profile? The @default set would be pulled
> in by @selected when @default is listed in /var/lib/portage/world_sets
> (in stable portage, @selected currently only pulls in atoms from
> /var/lib/portage/world).

If @selected only pulls in /var/lib/portage/world , what pulls in
/var/lib/portage/world_sets ?  You mention it, but don't say what pulls 
it in, if as you say @selected doesn't.

-- 
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"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman