CURRENT: can not build 13-STABLE: missing .a lib files?

From: FreeBSD User <freebsd_at_walstatt-de.de>
Date: Fri, 20 Aug 2021 11:29:49 UTC
Running several flavours of CURRENT (all within the last three days rebuilt and
updated,  FreeBSD 14.0-CURRENT #16 main-n248811-1a4d7030bbf: Thu Aug 19
15:13:39 CEST 2021 amd64,  and today, for instance, fail either to build a
poudriere 13-STABLE jail or buildworld for 13-STABLE for FreeBSD base packages.


"poudriere jail -j 13amd64 -u -b" dies somewhere unspectatcular with

[...]
===> share/man/man4 (all)
--- all_subdir_stand ---
*** [libsa_pie.a] Error code 1

make[4]: stopped in /pool/poudriere/jails/13amd64/usr/src/stand/libsa


while the package building process dies with a 

[...]
install: libc_p.a: No such file or directory


Kind regards,

oh