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From: "Steven G. Kargl" <sgk@REMOVEtroutmask.apl.washington.edu>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: the utmp.h header file
Date: Fri, 22 Nov 2024 21:26:09 -0000 (UTC)
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On Fri, 22 Nov 2024 18:04:39 -0300, Wolfgang Agnes wrote:

> It seems FreeBSD has either evolved the system to use utmpx.h or perhaps
> it never used the utmp.h header we perhaps find in GNU systems.  I've no
> idea.

% git log /usr/src/include/utmpx.h | more

commit a627ac61ab8d660acfe6c88b01bdca8e8c1590aa
Author: Ed Schouten <ed@FreeBSD.org>
Date:   Wed Jan 13 17:29:55 2010 +0000

    Implement <utmpx.h>.
....
    I'll bump __FreeBSD_version later this evening. I first
    want to convert everything to <utmpx.h> and get rid of
    <utmp.h>.

> By the way, I'm not really interested in qbiff.  On the contrary, I'm
> more interested in understanding FreeBSD with regard to this
> compatibility question involving other systems.

It seems utmp.h was removed in the 9.0 timeframe.  It is present
in 8.4.

-- 
steve