Cannot create users

Perhaps I didn't get an answer to this question because I posted it
originally late last Friday, and it got lost over the weekend. So, I will
try again this Monday morning. :-)

I did a completely new installation of 7.0.3 via rpm. When I su'd to
'postgres' and tried to create another user (me) this is what I saw:

[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

Will someone please explain to me what I missed during the installation? I
know it must be something simple, but I don't see the answer in the
administrator's manual. (If the answer is there, please pass me a pointer to
the page number and I'll go read it for myself.)

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