I have installed some GNU software in /usr/local/bin and man
files into /usr/local/man/cat1 and /usr/local/man/man1.
I have done catman -w -M /usr/share/man:/usr/local/man to
have new windex database.
When I enter man <keyword> (<keyword> refers to GNU software), man does not find it.
When I set MANPATH=/usr/share/man:/usr/local/man, and then
man <keyword>, man still does not find it.
When I enter man -M /usr/share/man:/usr/local/man <keyword>,
man does find it.
What have I missed when I created windex database ?