default configuration builts with the snapshot taken at
05-24-230001 but not with the snapshot from
05-26-230001 (--without-threads builts)

I get the following compiler complaint when trying to
build python_2003-05-26-230001: 

c++  -Wl,--export-dynamic -o python  Modules/python.o 
libpython2.3.a -lutil   -
lm  
libpython2.3.a(posixmodule.o): In function `posix_tmpnam':
Modules/posixmodule.c:5785: warning: tmpnam() possibly
used unsafely; consider u
sing mkstemp()
libpython2.3.a(posixmodule.o): In function `posix_tempnam':
Modules/posixmodule.c:5738: warning: tempnam() possibly
used unsafely; consider 
using mkstemp()
libpython2.3.a(thread.o): In function
`PyThread_start_new_thread':
Python/thread_pthread.h:217: undefined reference to
`pthread_create'
Python/thread_pthread.h:253: undefined reference to
`pthread_detach'
*** Error code 1

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I think what's missing here is the correct library reference.

I don't have a 5.x box at the moment, so can't check, but as
I recall, there are 2 options at the moment:-
 - libkse;
 - libthr.

Could you check my recollection and try adding the
appropriate library reference to the Makefile to see whether
you get a viable build?

Some autoconf-fu would then be required to make the setting
stick.

As the FreeBSD core team haven't yet designated anything
from the 5.x line as stable, this makes keeping track of the
non-trivial threading changes hard.

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adding 

     LIBC=-lkse 

to the Makefile seems to do the trick. Python builds without
any 
further problems (I didn't use autoconf)

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Fixed with patch #758910.