Python3: import fails with "undefined symbol: PyString_FromStringAndSize"

[WGH-]

As of current master, importing netfilterqueue fails:

ImportError: .../lib/python3.4/site-packages/netfilterqueue.cpython-34.so: undefined symbol: PyString_FromStringAndSize

Issue #9 reports the same problem, but it was closed some time ago, and since then Python 3 support was supposedly merge into master.

So it seems that the problem reappeared again.