Failure with make check-world for pgtypeslib/dt_test2 with HEAD on OSX

Hi,

This morning while running make check-world on my OSX Mavericks laptop, I found the following failure:
test pgtypeslib/dt_test2      ... stderr FAILED (test process was terminated by signal 6: Abort trap)
(lldb) bt
* thread #1: tid = 0x0000, 0x00007fff8052c866 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGSTOP
  * frame #0: 0x00007fff8052c866 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff83cb035c libsystem_pthread.dylib`pthread_kill + 92
    frame #2: 0x00007fff81899bba libsystem_c.dylib`__abort + 145
    frame #3: 0x00007fff8189a46d libsystem_c.dylib`__stack_chk_fail + 196
    frame #4: 0x000000010f7cb3bb libpgtypes.3.dylib`PGTYPESdate_from_asc(str=0x000000010f6a2d6c, endptr=0x00007fff5055e488) + 635 at datetime.c:104
    frame #5: 0x000000010f6a260f dt_test2`main + 255 at dt_test2.pgc:91
    frame #6: 0x00007fff87acc5fd libdyld.dylib`start + 1
    frame #7: 0x00007fff87acc5fd libdyld.dylib`start + 1