[Semibug] Problem with mtree

[Jonathan Drews]

My computer system:
$ uname -mprsv
OpenBSD 7.3 GENERIC.MP#1125 amd64 amd64

I have a problem with running mtree as root. I want to make a base file
for / and all it's subdirectories using the command:

# mtree -ck sha256digest > /root/root24Apr2023.mtree

but I get the following error message:

unknown keyword: sha256digest.

however if I run it as an ordinary user it works fine:

$ mtree -cK sha256digest  > homeCleetus3.mtree

look :
$ cat homeCleetus3.mtree | head
        
#          user: cleetus
#       machine: Leo.my.domain
#          tree: /home/cleetus
#          date: Mon Apr 24 01:07:21 2023

# .
/set type=file uid=1000 gid=1000 mode=0640 nlink=1
.               type=dir mode=0755 nlink=58 time=1682319490.964620832
    .Xauthority mode=0600 size=450 time=1682149878.454612237 \

sha256digest=4372c73e50cf1cc00822db9db1631e4f7ad7f71d9724633ab740b5fcfbb19a71

if I run mtree wlike so:
# cd /
# mtree -c /root/root24Apr2023.mtree

it records the files and directories.

What am I doing wrong here? I am creating a base file of directories
in case of intrusion. If I suspect an intrusion, then I would cd  to
root (/) and run:

mtree -f root24Apr2023.mtree > diffRoot.mtree

and look for any changed files.

FYI I used this tutorial on mtree:
https://forums.freebsd.org/threads/small-guide-on-using-mtree.61113/


--
Kind regards,
Jonathan