slackware 12, man doesn't work

I installed emacs, but 'man emacs' can't work.
because my emacs installed to /usr/local.
and I ./configure --prefix=/usr, 'man emacs' can work well.

I check /usr/lib/man.conf, but I can't solve the problem.

Anyone can help me?

regards,
dracox

if installed Emacs to /usr/local
sudo ln -s /usr/local/emacs/share/man/man1/emacs.1 /usr/local/man/man1/emacs.1

MANPATH ?