: fg: no job control
: apropos: manpath is null
: Error executing formatting or display command.
: System command exited with status 256.
This is a very well-known bug in certain Slackware distributions.
Either get the original man-1.4d distribution (say, from sunsite),
or have a look at the simple_fixes directory that zenon is
maintaining - you may well have a handful of other problems,
also caused by flaws in this same distribution.