[Bug 268479] lib/libc/stdlib/getenv.c may have a problem with putenv()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268479

--- Comment #8 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #7)

For reference for a build of pkg for 13.1-RELEASE-p5 on a
FreeBSD buildserver:

=>> Building ports-mgmt/pkg
build started at Sun Dec  4 01:54:07 UTC 2022
port directory: /usr/ports/ports-mgmt/pkg
package name: pkg-1.18.4
building for: FreeBSD 131arm64-default-job-01 13.1-RELEASE-p5 FreeBSD
13.1-RELEASE-p5 arm64
maintained by: pkg@FreeBSD.org
Makefile ident: 
Poudriere version: 3.2.8-23-ga7f8d188
Host OSVERSION: 1400073
Jail OSVERSION: 1301000
Job Id: 01

---Begin Environment---
SHELL=/bin/csh
OSVERSION=1301000
UNAME_v=FreeBSD 13.1-RELEASE-p5
UNAME_r=13.1-RELEASE-p5
. . .

Note t hat  the build server was running main (1400073) as its
boot environment but the build's jail was for 1301000. Note the
UNAME_r and UNAME_v assignments for what the builder process
would see for uname -r and uname -v output: a very specific
patch level for 13.1-RELEASE .

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