Bizarre 7.3.2 bug

On one machine (installed as 7.3.1, upgraded to 7.3.2):

usa=# select version();                              version
---------------------------------------------------------------------PostgreSQL 7.3.2 on i386-portbld-freebsd4.7,
compiledby GCC 2.95.4
 
(1 row)

usa=# select ''::integer;
ERROR:  pg_atoi: zero-length string

On another machine (installed as 7.3.2):

australia=# select version();                              version
---------------------------------------------------------------------PostgreSQL 7.3.2 on i386-portbld-freebsd4.4,
compiledby GCC 2.95.3
 
(1 row)

australia=# select ''::integer;
WARNING:  pg_atoi: zero-length stringint4
------   0
(1 row)

What the???

Chris