7.3: outdated mandoc.db lacks mutt(1) entry, run makewhatis /usr/local/man

[Martin Schröder]

Hi,
after upgrading to 7.3 man is somehow confused:

> man mutt
man: /usr/local/man/mandoc.db: Permission denied
man: outdated mandoc.db lacks mutt(1) entry, run makewhatis /usr/local/m

Neither
   makewhatis /usr/local/man
nor
   sudo makewhatis /usr/local/man
helps. :-(

How to fix?

Thanks in advance
     Martin