"No module named _md5" error in Python 2.5

[Silvio Domini]

I have tried to install the latest setuptools for Python 2.5
by using the script  ez_setup.py from PEAK's website
but the script aborts with the error:

File "/opt/local/lib/python2.5/hashlib.py", line 31, in
__get_builtin_constructor
    import _md5
ImportError: No module named _md5

With the official Python 2.5 distribution such an error
doesn't occur and the command "from hashlib import md5"
works flawlessly.
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