> This does not give the same results as the mentioned 'magic'...
> 
> emerge -u `qpkg -nc -I` -p give me
[snip]

> And emerge -uDp world gives me:
[snip] 

> Surely this is a bug?

Actually, it not... Say you want to try out a package and when
installing it you install a whole bunch of dependencies with it. When
you later uninstall the package that you tried out it won't uninstall
all the dependencies that where drawn in as dependencies, which means
that they're still installed on your system. But since you didn't
explicitly installed them by 'emerge dep1; emerge dep2...' they're not
in the world-file either, and thus 'emerge -Du world' won't update those
packages if they're not depended on by some other package that you've
installed later on...

Patrick Börjesson

P.S.
Btw... Sorry for not mentioning the '--oneshot'-option in my first
reply
D.S.

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