[PyQt] ImportError: /usr/lib/python3.3/site-packages/PyQt5/QtGui.so: undefined symbol: PyUnicode_DecodeASCII

[bootch at nc.rr.com]

My environment:
Ubuntu 13.04
Qt5.0.1 (as installed by Ubuntu)
Python3.3 (as installed by Ubuntu)
python3-dev (installed using Ubuntu Software Center)
sip-4.15.2 (downloaded)
PyQt-gpl-5.0.1 (downloaded)

When starting my app:

ImportError: /usr/lib/python3.3/site-packages/PyQt5/QtGui.so: undefined symbol: PyUnicode_DecodeASCII

One post http://effbot.org/pyfaq/when-importing-module-x-why-do-i-get-undefined-symbol-pyunicodeucs2.htm
seems to indicate that the python interpreter is built with a different unicode implementation than the imported extension module??
I can't find any other build switches for PyQt that might be appropriate.

I haven't found a solution yet.

(Other info: I am using Eclipse IDE and struggled with setting it up for Python3, and setting up PYTHONPATH.
But I get the same error as above from Python started on a command line.)