why some man pages are not found?

[Zhang Weiwu]

Hello. On my FreeBSD 5.2 -RELEASE I have several man pages right there 
installed in /usr/X11R6/man directory, but man(1) won't show them. Gnome 
help don't have them listed among manuals. Can anyone explain why? Thank 
you.

Here is a commandline example:

zhangweiwu at thinkpad:~>pkg_info -L gdm2-2.4.4.5 fluxbox-0.1.14_2 | grep man
/usr/X11R6/man/man1/fluxbox.1.gz
/usr/X11R6/man/man1/gdm.1.gz
zhangweiwu at thinkpad:~>man gdm
No manual entry for gdm
zhangweiwu at thinkpad:~>man fluxbox
No manual entry for fluxbox

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