Re: Get ${OSREL} at install time

* Nuno Teixeira <eduardo@freebsd.org> [20230418 13:45]:
> I will do further tests and open an PR so other people try it (I hope).

I would suggest a final improvement: You should probably sanity-check
what you get from freebsd-version (and in case it isn't sane, stick to
the compile-time defaults). That's because it's perfectly possible to
install packages with "pkg -r" into a prefix that doesn't even have base
installed (so, also no freebsd-version available there).

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