Installing plpython on 8.4

I'm having trouble installing plpython in 8.4. I tried under Windows
(one click installer from EDB) and under Ubuntu (linux binary).  In both
cases I was told:
could not load library 8.4/lib/postgresql/plpython.(so|dll)

Both systems have python 2.5 installed. And plpython was working in 8.3
(and I believe 8.4 B1) on both. Any ideas what I'm doing wrong?

Scott

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