`configure` doesn't show a result of `utmp`?

[tsutsui]

configure.in has the following line to show a result of checks about utmp: https://github.com/arakiken/mlterm/blob/92fa70f1da41fb2c8affd387e775d95f3e75ead4/configure.in#L2429

but it looks the variable $utmp is not set anywhere and each log in github actions shows nothing.

Furthermore, configure.in treats setutxent() as SysV, but it has been in the POSIX (since 2001): https://pubs.opengroup.org/onlinepubs/007908799/xsh/setutxent.html https://pubs.opengroup.org/onlinepubs/009695399/functions/setutxent.html https://pubs.opengroup.org/onlinepubs/9699919799/functions/setutxent.html https://pubs.opengroup.org/onlinepubs/9799919799/functions/setutxent.html

so I wonder if we should prefer it rather than utempter_add_record(3) derived from Linux that requires extra libraries. https://manpages.debian.org/unstable/libutempter-dev/utempter_add_record.3.en.html