OpenBSD comes with the Arla AFS client built-in. To configure, as root:
mkdir /afs echo hcoop.net > /etc/afs/ThisCell echo afs=YES >> /etc/rc.conf.local echo '[appdefaults] libkafs = { afs-use-524 = local }' > /etc/kerberosV/krb5.conf
Then reboot. Now as normal user you can get access with:
kinit username@HCOOP.NET afslog hcoop.net
Done.