int4out(lo) does not exist (create type)

At http://gborg.postgresql.org/project/psqlodbc/faq/faq.php?faq_id=52

a method is presented for creating a type: 'lo', for handling
large data objects that may be imported from other DBs such as
MS Access.

create type lo (
   internallength=4,
   externallength=10,
   input=int4in,
   output=int4out,
   default='',
   passedbyvalue
);

When this command is presented to pg 7.3, the response is:

ERROR:  TypeCreate: function int4out(lo) does not exist

regards,

bullshark