psql malloc problem

Postgres version 8.3.0 on Mac OSX Version 10.4.11

Built from source with no parameters to configure script (ie a simple
default build).

Error occurs every time I exit psql:

marc:[prototype]$ psql -d postgres
Welcome to psql 8.3.0, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
        \h for help with SQL commands
        \? for help with psql commands
        \g or terminate with semicolon to execute query
        \q to quit

postgres=# \q
psql(3050) malloc: *** error for object 0x1807000: incorrect checksum
for freed object - object was probably modified after being freed,
break at szone_error to debug
psql(3050) malloc: *** set a breakpoint in szone_error to debug
Segmentation fault
marc:[prototype]$ psql -l
         List of databases
    Name    |  Owner   | Encoding
-----------+----------+-----------
  monkey    | marc     | SQL_ASCII
  postgres  | postgres | SQL_ASCII
  template0 | postgres | SQL_ASCII
  template1 | postgres | SQL_ASCII
(4 rows)

marc:[prototype]$


gdb backtrace:

monkey=# \q
psql(2895) malloc: *** error for object 0x1807000: incorrect checksum
for freed object - object was probably modified after being freed,
break at szone_error to debug
psql(2895) malloc: *** set a breakpoint in szone_error to debug

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x305c303c
0x900065ed in szone_free ()
(gdb) bt
#0  0x900065ed in szone_free ()
#1  0x90005588 in free ()
#2  0x90010f5f in fclose ()
#3  0x964a891c in history ()
#4  0x964a9b05 in write_history ()
#5  0x00009cbc in saveHistory ()
#6  0x00009dd2 in finishInput ()
#7  0x900103ec in __cxa_finalize ()
#8  0x900102e8 in exit ()
#9  0x00002422 in _start ()
#10 0x00002341 in start ()
(gdb)


Please let me know what else I can do to assist in tracking this down.
__
Marc