apropos(1) with MANPATH is broken

[Steve Kargl]

The recent change from historic mandoc to the newer stuff
has broken apropos(1).  From the apropos(1) manpage 


 MANPATH   The standard search path used by man(1) may be changed by
           specifying a path in the MANPATH environment variable.
           Invalid paths, or paths without manual databases, are
           ignored.  Overridden by -M.  If MANPATH begins with a
           colon, it is appended to the default list; if it ends with
           a colon, it is prepended to the default list; or if it
           contains two adjacent colons, the standard search path is
           inserted between the colons.  If none of these conditions
           are met, it overrides the standard search path.


In my .cshrc I have

setenv MANPATH /usr/local/man:/usr/share/man:$HOME/man

% setenv | grep MANP
MANPATH=/usr/local/man:/usr/share/man:/home/kargl/man
% apropos apropos
(Warning: MANPATH environment variable set)
/usr/home/kargl/man/mandoc.db: No such file or directory
apropos, whatis(1) - search manual page databases

Historically, there is no noise.  Neither the warning about
MANPATH being set nor a message about a missing .db file were
printed.  This should at least be hidden behind -v.

% unsetenv MANPATH
% apropos apropos
/usr/home/kargl/man/mandoc.db: No such file or directory
/usr/local/lib/perl5/site_perl/man/mandoc.db: No such file or directory
/usr/local/lib/perl5/5.16/perl/man/mandoc.db: No such file or directory
apropos, whatis(1) - search manual page databases

Unsetting MANPATH seems to not revert to a standard manpath of
/usr/share/man (or maybe /usr/local/man:/usr/share/man).  Also, why is
it suddenly picking up the perl5 directories?  There is no /etc/man.conf
on the system and login.conf does not define manpath.

setenv MANPATH :$HOME/man
% apropos apropos
(Warning: MANPATH environment variable set)
/usr/home/kargl/man/mandoc.db: No such file or directory

MANPATH was not appended to the standard search path.


So, starting the exercise over with MANPATH removed from .cshrc.
Re-login-ing into the system

% setenv | grep MAN

MANPATH is not set as expected.

% apropos apropos
/usr/home/kargl/man/mandoc.db: No such file or directory
/usr/local/lib/perl5/site_perl/man/mandoc.db: No such file or directory
/usr/local/lib/perl5/5.16/perl/man/mandoc.db: No such file or directory
apropos, whatis(1) - search manual page databases

So, some default search path is followed

% setenv MANPATH :$HOME/man
% apropos apropos
(Warning: MANPATH environment variable set)
/usr/home/kargl/man/mandoc.db: No such file or directory
% man apropos
No manual entry for apropos


-- 
Steve