The hunt for AFK's

qcheck(1) is the key to looking for inconsistencies between what portage installed and a live system: qcheck -aTC

or with nice colour: qcheck -aT

Filtering out python, ... etc false positives (AFK appears to be qcheck code for missing files):

#!/bin/sh
DATE=`date +%Y%m%d`
OUT=${DATE}.log

qcheck -aTC >$OUT 2>&1

filter='/usr/lib/python2.4|/usr/lib/gimp/2.0/python|\
/usr/share/javatoolkit/pym|\/usr/kde/3.5/share/doc|\
/usr/share/icons/hicolor|/usr/share/webapps/phpmyadmin'

grep AFK $OUT | egrep -v $filter | sort >${DATE}-afk.log
grep MD5-DIGEST $OUT | egrep -v $filter | sort >${DATE}-md5.log