pg_dumpall: permission denied for relation pg_shadow

I tried using pg_dumpall and got this error:

pg_dumpall: query failed: ERROR: permission denied
for relation pg_shadow
pg_dumpall: query was: SELECT usename, usesysid,
passwd, usecreatedb, usesuper, valuntil, (usesysid =
(SELECT datdba FROM pg_database WHERE datname =
'template0')) AS clusterowner FROM pg_shadow

I haven't messed around with template0. This is a
recent installation of postgres (8.0.x), done via yum.

Any idea what the problem is and how to fix it?

thanks,
CSN

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