Missing pg_hba.conf

Now that I successfully installed the packages for 7.0.3-2, I went to
create a new user. Logged in as 'postgres', I tried to create me as a
postgres user. This is what resulted:

[postgres(at)salmo rshepard]$ createuser rshepard
Shall the new user be allowed to create databases? (y/n) y
Shall the new user be allowed to create more new users? (y/n) y
psql: Missing or erroneous pg_hba.conf file, see postmaster log for details
createuser: creation of user "rshepard" failed

Again, it's been a while, so I don't remember if I need to create
/var/lib/pgsql/pg_hba.conf by hand. What's the procedure, please?

Thanks,

Rich

Dr. Richard B. Shepard, President

Applied Ecosystem Services, Inc. (TM)
Making environmentally-responsible mining happen. (SM)
--------------------------------
2404 SW 22nd Street | Troutdale, OR 97060-1247 | U.S.A.
+ 1 503-667-4517 (voice) | + 1 503-667-8863 (fax) | rshepard(at)appl-ecosys(dot)com