[gentoo-user] What causes a package to be brought in during a big emerge?

[Andrew Lowe]

Hi all,
        I've done an:

"emerge --pretend -NuD world"
and whilst reviewing the output, it lists an old package that I played 
around with in the past but now no longer need. In turn I do:

"emerge -C oldPackageNoLongerNeeded"

the package is removed and I in turn do another

"emerge --pretend -NuD world"

but "oldPackageNoLongerNeeded" is still there, although emerge tells me 
its now gone from "U" to "N" ie Update to New. I've fired up "ufed" and 
removed what I thought would be the appropriate USE tag, run the emerge 
again and it's still there. I've tried:

"equery depends oldPackageNoLongerNeeded"

and it lists nothing as needing "oldPackageNoLongerNeeded"

I've looked through the emerge help and nothing springs to mind as 
telling me why "oldPackageNoLongerNeeded" is being brought in.

	So after that rambling intro, is there a package/utility that will tell 
me, when in this situation, what package needs 
"oldPackageNoLongerNeeded" and why it is being brought into my emerge.

        Thanks for any help,
                Andrew

p.s. Tried Google on this and just couldn't seem to get the right 
keywords o find anything.....