Why some manpages are missing from `Man`?

**What I'm using**: - GNU Emacs 27.2 - Manjaro Linux 21.2.5 (codename: Qonos) - Doom core v3.0.0-dev - Doom modules v22.03.0-dev - Ivy Version: 0.13.4 **Issue***: Some manpages do not show up when I run `M-x man`. Apparently, this only happens with non-default packages which I installed manual with `pacman`, probably with whatever I install from the `aur` as well, but I didn't test it. For example, on the command line,`$ man yt-dlp` shows me the correct manpage, while on Emacs `M-x man` followed by `yt-dlp` does not list its corresponding manpage. `$ whereis yt-dlp` show that `yt-dlp` manpage is at the correct location: `yt-dlp: /usr/bin/yt-dlp /usr/share/man/man1/yt-dlp.1.gz`. The issue occurs with `ivy-mode` disabled as well. *Posting here first instead of /r/doom because I figure this might be a system vs Emacs thing, and not a Doom thing...*

`/usr/share/man` is awfully standard, so it sounds odd. Any difference between shell `echo $MANPATH` and emacs `M-x getenv RET MANPATH` ?

Thanks. `$ echo $MANPATH` (on a non-Emacs shell) is empty. `M-x getenv RET MANPATH` doesn't list `MANPATH`.

Does apropos(1) report yt-dlp when you try it? If not, then you have to update it.

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Sounds like it's unset everywhere then, so that shouldn't be the reason for the difference you're seeing.

Thanks. That seems to work. Can I automate this?

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I see. alias it is. Thanks!