as root, 'emerge man' fail.
* Adding group 'man' to your system ...
* - Groupid: 15
/opt/gentoo/usr/portage/eclass/eutils.eclass: line 773: groupadd: command not found
Is-it a PATH problem ?
it partially is, as groupadd is in /usr/sbin/groupadd, but I'm not sure if existing code can deal with it.
do you have a groupadd utility availble? e.g. `which groupadd`