"lo" large object

Just got stuck in the v7.2->v7.3 load:

4672: ERROR:  TypeCreate: function int4out(lo) does not exist

lo being the type to keep psqlodbc happy when importing M$ access files. The
old definition was:

--
-- TOC entry 2 (OID 229586)
-- Name: lo; Type: TYPE; Schema: ; Owner: prlw1
--

CREATE TYPE lo (
    INTERNALLENGTH = 4,
    INPUT = int4in,
    OUTPUT = int4out,
    DEFAULT = '',
    ALIGNMENT = int4,
    STORAGE = plain,
    PASSEDBYVALUE
);

Suggestions? (Is my lo defn out of date, or maybe psqlodbc?)

Cheers,

Patrick