Using pyPgSQL on Mac OS X Tiger

I downloaded and built the package on Mac OS X 10.4 via "python
setup.py build".
Then I installed it with "python setup.py install"
"import pyPgSQL" works, but "from pyPgSQL import PgSQL" brings up an
error message.
It sais: "ImportError: No module named libpq"

The folderstructure in site-packages looks like this:
./pyPgSQL/
./pyPgSQL/__init__.py
./pyPgSQL/__init__.pyc
./pyPgSQL/PgSQL.py
./pyPgSQL/PgSQL.pyc
./pyPgSQL//libpq/
./pyPgSQL//libpq/__init__.py
./pyPgSQL//libpq/__init__.pyc
./pyPgSQL//libpq/libpqmodule.so

I also renamed the module twice, first in the file system and then in
setup.py.
so the last file looked like this:
./pyPgSQL//libpq/libpq.so
Still the same Error.
Does anyone know of a solution?
Regards,
atillla

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