Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> 7.4 pg_dump should be able to use 7.3's libpq --- the API has not
> changed, so we didn't bump the major number.
No, the other way 'round. 7.3 pg_dump or psql would work with a 7.4
libpq.so, but I don't believe 7.4 pg_dump or psql would work with a
7.3 libpq.so.
regards, tom lane