pg_dump/restore problem

["renneyt@xxxxxxxxx" <renneyt@xxxxxxxxx>]

I am trying to move some data from an 8.0.7 instance to a 7.4.8 
instance. I did a pg_dump and then did a pg_restore.
For the most part the data transferred through to the older instance but 
I had problems with the sequence updates.

SELECT pg_catalog.setval(pg_catalog.pg_get_serial_sequence('nw_foo', 
'foo_id'), 678, true);
ERROR:  function pg_catalog.pg_get_serial_sequence("unknown", "unknown") 
does not exist
HINT:  No function matches the given name and argument types. You may 
need to add explicit type casts.

I am looking for a an alternative to manually issuing alter sequence 
commands.

Any help appreciated.