Re: [gentoo-user] Painted into a corner: avahi and mDNSResponder

[Volker Armin Hemmann]

On Sonntag 12 Oktober 2008, Alan McKinnon wrote:
> On Sunday 12 October 2008 10:25:51 Andrey Vul wrote:
> > On Sun, Oct 12, 2008 at 3:51 AM, Alan McKinnon <alan.mckinnon@×××××.com>
>
> wrote:
> > > On Sunday 12 October 2008 08:04:22 Volker Armin Hemmann wrote:
> > >> On Sonntag 12 Oktober 2008, Alan E. Davis wrote:
> > >> > Almost perpetually, the following packages or their versions are
> > >> > blocking.  I have run emerge -e system several times.  Some other
> > >> > problems were cleared up, and this
> > >> > avahi--mDNSResponder/mdnsresponder-compat whatever it all is, just
> > >> > keeps coming back even when solved by some skullduggery.  I've
> > >> > removed both of them at one time or another.
> > >> >
> > >> > [blocks B     ] net-dns/avahi ("net-dns/avahi" is blocking
> > >> > net-misc/mDNSResponder-107.6-r5)
> > >> >
> > >> > [blocks B     ] net-misc/mDNSResponder ("net-misc/mDNSResponder" is
> > >> > blocking net-dns/avahi-0.6.23)
> > >> >
> > >> > I guess the problem is that I am running gnome and also have two or
> > >> > three different versions/slots of kde installed.  I suppose, then,
> > >> > it's remarkable that only these blocks are showing up?
> > >> >
> > >> > Can someone lend a hand on this?  Anything I do is little more than
> > >> > blind tinkering.
> > >> >
> > >> > Alan
> > >>
> > >> set the avahi useflag, unmerge mdnsresponder, emerge avahi.
> > >
> > > That looks familiar. I remember similar deep blocks myself - it was
> > > nasty at the time.
> > >
> > > For the OP's benefit, here's a high level summary of what is going on:
> > >
> > > Avahi and mDNSResponder implement a system called ZeroConf, first
> > > designed by Apple. It's a way for machines on a network to find each
> > > other and what network features they support. These systems are quite
> > > low-level so unfortunately the implementations are often incompatible.
> > >
> > > By and large you will find that Gnome stuff supports Avahi and KDE
> > > stuff supports mDNSResponder, so the only way out of this mess is often
> > > extensive use of 'equery hasuse', 'equery depends' and 'emerge -pvt' so
> > > see what pulls in what. But first you should research what these things
> > > are so you can make intelligent decisions about what to include and
> > > what to drop. The thing that cleared it up for me was an interview with
> > > the KDE team lead responsible for these features - Google will find it
> > > for you.
> >
> > IIRC mdnsresponder-compat USE flags allows use of avahi in KDE (3).
>
> I believe you are correct:
>
> alan@nazgul ~ $ grep mdns /var/portage/profiles/use.*
> /var/portage/profiles/use.local.desc:net-dns/avahi:mdnsresponder-compat -
> Enable compat libraries for mDNSResponder

just grep for avahi in /usr/portage/kde-base ....