[gentoo-user] emerge all packages which depend on P : how to

[Helmut Jarausch]

Hi,

I have a very simple question. How to emerge (update) all packages  
which depend on some
given package P.
I've tried

emerge -uv1 `equery -q d P`

or  emerge -uv1 `qdepends -q -Q P`

but both commands (equery and qdepends) generate a list with the  
version attached like
  app-editors/kile-2.1.3
which emerge doesn't like (unless there is an '= in front of each name)

Is there an easy way to do so without resorting to shell/python  
scripting?

Many thanks for a hint,
Helmut