> 1. Have you tested this with Python 3.x at all?  I'd expect the same issues to show up for Python 3.1 and 3.2.

Yes, I can reproduce this in 2.7, 3.1 and 3.2.

> 2. Also, do you have the relevant configure output to hand?  On my machine, the output from './configure' includes:
> 
> checking for uint32_t... yes
> checking for uint64_t... yes
> checking for int32_t... no
> checking for int64_t... no
> checking for ssize_t... yes
>
> what do you get here?  (Aside:  those .... 'no's look odd to me;  I think there may be an autoconf bug here.)

Same here. It looks like a bug in autoconf:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560105

My output is below:

"""
checking for uint32_t... yes
checking for uint64_t... yes
checking for int32_t... no
checking for int64_t... no
checking for ssize_t... yes
"""

> 3. Do you know which header file declares uint32_t on FreeBSD 4?

They are declared in inttypes.h.

"""
/*
 * This file is in the public domain.
 * $FreeBSD: src/sys/sys/inttypes.h,v 1.2 1999/08/28 00:51:47 peter Exp $
 */

#ifndef _SYS_INTTYPES_H_
#define _SYS_INTTYPES_H_

#include <machine/ansi.h>

typedef __int8_t        int8_t;
typedef __int16_t       int16_t;
typedef __int32_t       int32_t;
typedef __int64_t       int64_t;

typedef __uint8_t       uint8_t;
typedef __uint16_t      uint16_t;
typedef __uint32_t      uint32_t;
typedef __uint64_t      uint64_t;

typedef __intptr_t      intptr_t;
typedef __uintptr_t     uintptr_t;

#endif /* !_SYS_INTTYPES_H_ */
"""