PQnotifies() in 7.3 broken?

Thanks to Rod Taylor's kind help in donating a system account, I've been
able to test libpqxx against postgres 7.3.  Unfortunately, I'm running
into several problems.  One thing that broke libpqxx was a change in 
cursor behaviour that according to Sigurdur Gunnlaugsson seems to be
gone in the 7.4 development tree.  But I'm hitting other snags as well.

When receiving a trigger notification under 7.3, the structure returned
by PQnotifies() appears to be bogus.  In a test I ran, its be_pid was
consistently zero and its relname pointed into never-neverland.

Has anyone else come across this?


Jeroen