May I ask whether FreeBSD's pkg binary packages are compiled on machines with the release version or the stable version?

From: ykla <yklaxds_at_gmail.com>
Date: Mon, 14 Aug 2023 17:16:26 UTC
Hi,

May I ask whether FreeBSD's pkg binary packages are compiled on machines
with the release version or the stable version?

I forgot where this explanation appeared. I've been searching for a long
time and haven't found it. Does anyone know where this explanation is in
any documentation or wiki?

Thanks.

ykla