Roman Zilka (Mon, 4 Jul 2011 23:34:01 +0200):
> Neil Bothwick (Mon, 4 Jul 2011 22:16:18 +0100):
> > On Mon, 4 Jul 2011 22:48:44 +0200, Roman Zilka wrote:
> > 
> > > Not quite. This is how I'm thinking: if '-ep world' says virtual/pam
> > > needs to be installed, then it either
> > > * is in the world file, or
> > > * is in the system set, or
> > > * is a buildtime or runtime dependency (immediate or deep) of one of the
> > > packages in the world set (i.e., world file and system set combined).
> > 
> > There's another possibility, that it is one of a number of packages that
> > satisfy a particular dependency, the first listed one. If you have
> > another package installed that fulfils this dependency, emerge -u world
> > won't need to do anything, but with emerge -e world you are telling
> > portage that the other package is not installed, so it picks the first
> > dependency from the list.
> 
> I checked that - in this case, there are no alternatives.

Ah, I see. I'm sorry, I wasn't thinking enough. Yeah, virtual/pam may
be one of a list. But if nothing else, I have openssh and openssh says:
RDEPEND="pam? ( virtual/pam )
No alternatives there. And I don't have virtual/pam, but do have
openssh. So why does '-uDN world' not pull virtual/pam in?

-rz

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