13-STABLE: can not cross build 13.0-RELENG and 13.1-RELENG, what on CURRENT works fine

I regular build for a NanoBSD appliance 13-STABLE, 13.0-RELENG and 13.1-RELENG
on either 14-CURRENT and 13-STABLE. Several days ago, some changes has been
made to /usr/src/Makefile.inc1, first on CURRENT and shortly after on 13.

As with today, building from sources either 13.1-RELENG and 13.0-RELENG on a
CURRENT host (recent 14-CURRENT!) works without problems.

On 13-STABLE (FreeBSD 13.1-STABLE #26 stable/13-n250478-bb8e1dfbff3: Thu Apr 14
10:47:51 CEST 2022 amd64) building either 13.0-RELENG or 13.1-RELENG fails!

On building from sources 13.0-RELENG I receive while in installworld:

[...]
--------------------------------------------------------------
>>> Install check world
--------------------------------------------------------------
mkdir -p /tmp/install.6R4Ifq8o
...
cp: [vdso]: No such file or directory
*** Error code 1
[...]

and on building from sources 13.1-RELENG while in installworld we get:

[...]
===> usr.bin/lex/lib (install)
install -l h -o root -g wheel -m 444
/home/ohartmann/Projects/TEST/fbsd13.1-dev/os-base/systemconf/../../world/amd64/TEST-DEV-amd64-13.1-RELENG/_.w/usr/lib/lib
ln_p.a
/home/ohartmann/Projects/TEST/fbsd13.1-dev/os-base/systemconf/../../world/amd64/TEST-DEV-amd64-13.1-RELENG/_.w/usr/lib/libl_p.a
install: link
/home/ohartmann/Projects/TEST/fbsd13.1-dev/os-base/systemconf/../../world/amd64/TEST-DEV-amd64-13.1-RELENG/_.w/usr/lib/libln_p.a -> /home/ohartman
n/Projects/TEST/fbsd13.1-dev/os-base/systemconf/../../world/amd64/TEST-DEV-amd64-13.1-RELENG/_.w/usr/lib/libl_p.a:
No such file or directory
*** Error code 71


Thanks in advance,

O. Hartmann