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From: Volker Armin Hemmann <volkerarmin@googlemail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] root partition lost - backup too old - please help
Date: Mon, 14 Jun 2010 20:24:23 +0200
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On Montag 14 Juni 2010, Helmut Jarausch wrote:
> Hi,
> 
> due to a disk crash I've lost my root partition.
> Unfortunately, the backup version is 4 weeks old.
> But my /usr partition is up-to-date and I have
> binary build-pkgs.
> What's the fastest way to restore the portage-relevant
> data on the root partition?
> 
> Many thanks for a hint,
> Helmut.

if /var/db survived, you can grep for /bin /lib /sbin etc in /var/db and 
install the packages hit.