Problem using MySQLdb: Symbol not found: _mysql_affected_rows

A colleague got this error message when trying to use MySQLdb from Django:

[...]
ImproperlyConfigured("Error loading MySQLdb module: %s" % e) django.core.exceptions.ImproperlyConfigured:
Error loading MySQLdb module: dlopen(/Users/roy/.python-eggs/MySQL_python-1.2.3c1-py2.5-macosx-10.5-i386.egg-tmp/_mysql.so, 2):
Symbol not found: _mysql_affected_rows
Referenced from: /Users/roy/.python-eggs/MySQL_python-1.2.3c1-py2.5-macosx-10.5-i386.egg-tmp/_mysql.so Expected in: dynamic lookup

He's using OS X 10.5, Python 2.5 (arriving with OS X), MySQL 5.1 & MySQLdb 1.2.3c1.

Any idea how to attack this?

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