Checkout the ports tree

$ cvs -qd fastly.cdn.openbsd.org:/cvs checkout -rOPENBSD_$(uname -r | tr . _) -P ports
$ cvs -qd anoncvs@anoncvs.ca.openbsd.org:/cvs checkout -rOPENBSD_$(uname -r | tr . _) -P ports

Update the ports tree

$ cvs -q up -rOPENBSD_$(uname -r | tr . _) -Pd