/var/imap/ Permission denied with RPMs

[adam at morrison-ind.com]

I downloaded the source 2.1.8 RPMs from http://home.teleport.ch/simix/

The build and installed just fine.  I started up saslauthd and I can
authenticate users with imtest.  /usr/libexec/cyrus/cyrus-master is running.

But if I try the following -
sardine:~ $ cyradm --user cyrus --server localhost --auth plain
Password: 
IMAP Password: 
sardine.morrison.iserv.net> lm
INBOX (\NoInferiors)  
sardine.morrison.iserv.net> cm user.adam
createmailbox: CREATE failed: Can't create mailbox node /var/imap/: Permission
denied
sardine.morrison.iserv.net> 

There is no /var/imap,  my config file looks like -
configdirectory: /var/lib/imap
partition-default: /var/spool/imap
defaultpartition: default
admins: cyrus
allowanonymouslogin: no
sieveuserhomedir: no
sievedir: /var/lib/imap/sieve
sendmail: /usr/sbin/sendmail
hashimapspool: true
sasl_pwcheck_method: saslauthd
sasl_mech_list: PLAIN
tls_cert_file: /usr/share/ssl/certs/cyrus-imapd.pem
tls_key_file: /usr/share/ssl/certs/cyrus-imapd.pem

Am I missing something obvious?