[SlugBug] Retarded question, re: su rights

[Beneath]

Hi,

Uhh, i seem to have forgotten how to restrict which users can su root...
Slack by default allows anyone, though right now i'd rather have the
configuration that OpenBSD defaults to - that only members of wheel can
su root.
How do i set it like this in Linux, and more specifically, slack?
I've looked through /etc in my half-sober state, and can't seem to find
anything related...

Cheers,
 - Daniel

-=-=-=-
PGP: http://spacecake.hypermart.net/pgp/ishikodzume.pubkey.asc
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