I have come accross this error a few times which my favorite 'Unix 
System Admin' book doesn't address.

I just installed procmail and the manuals were installed:

/usr/pkg/man/  (man5, etc..)

when I do a $man procmail  I get the response :

man: Formatting manual page...
/usr/bin/nroff: not found

I checked my man.conf and see where it says:

# Files typed by suffix and their commands.
# Note the order, .Z must come after .[1-9].Z, or it will match first.
_suffix         .0
_build          .0.Z            /usr/bin/zcat %s
_build          .0.gz           /usr/bin/gunzip -c %s

_build          .[1-9ln]        /usr/bin/nroff -man %s    <--- this is the one


_build          .[1-9ln].Z      /usr/bin/zcat %s | /usr/bin/nroff -man
_build          .[1-9ln].gz     /usr/bin/gunzip -c %s | /usr/bin/nroff -man
_build          .tbl            /usr/bin/tbl %s | /usr/bin/nroff -man
_build          .tbl.Z          /usr/bin/zcat %s | /usr/bin/tbl | 
/usr/bin/nroff


apparently the files inside /usr/pkg/man/man5 are all followed with a .5

(ie: access.5     canonical.5  procmailrc.5 relocated.5  transport.5  virtual.5
aliases.5    procmailex.5 procmailsc.5 sudoers.5    tw.config.5)

I would really LOVE to get in to this manual but can not until I 
figure out this problem and correct it.

Thanks for your help.  VERY Much appreciated!

Mark Nathan
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    Mark R. Nathan                        http://www.miraboomusic.com
    Miraboo Group                   mailto:president@miraboomusic.com
    President                                  mailto:mark@nathan.net