How do I find out why a package is being installed?

[lazloman]

I've looked through the portage, but can't find an answer to this. When I do a:

emerge -vaDp --newuse world

PEAR-PEAR is listed as package to be installed. I don't want this, so how do I find out what package needs it.
Sorry, if its somewhere in the docs, but I honestly could not find it.
Thanks
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2x Dell Optiplex GX200

"My Break-Dancing days are over, but there's always the Funky Chicken."
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[alex.blackbit]

use the --tree (-t) option of emerge. --update (-u) may be also useful since you already use --deep (-D).