Which means that /etc/env.d/00basic ought to include this line: MANPATH=/usr/share/man:/usr/local/share/man I just spent 30 minutes chasing that down. At my projected rate of reimbursement for consulting activies that means you owe me $3000 US.
gentoo's official ebuilds don't concern the /usr/local tree at all, however having /usr/local/share/man in the MANPATH does make sense, especially since /usr/local/bin is in PATH, etc. However, we never hired you for consulting.
Fixed on CVS.