Undefined symbol "__stdin at FBSD_1_0"

[Adrian]

Hi all,

fresh new  install of fbsd 12.1 on a new system yesterday - all good and 
working

updated afterwards to 12.1-RELEASE-p4

and i  can't boot anymore :

ld-elf.so.1: /lib/libedit.so.7 : Undefined symbol "__isthreaded at FBSD_1_0"

Enter full pathname of shell or RETURN for /bin/sh


reinstalled OS again today:

after freebsd-update to 12.1-RELEASE-p5

ld-elf.so.1: /lib/libedit.so.7 : Undefined symbol "__stdin at FBSD_1_0"

Enter full pathname of shell or RETURN for /bin/sh


any clues ?

thanks

Adrian