Export scripts fail with a ValueError on Python 3.3

Whenever I try to export a scene to, say, an .obj file in Blender running under Ubuntu 13.04, I get the following exception:

  Traceback (most recent call last):
    File "/usr/lib/blender/scripts/addons/io_scene_obj/__init__.py", line 328, in execute
      from . import export_obj
  ValueError: level must be >= 0

  location:<unknown location>:-1

Research suggests that this could be due to to this Python 3.3 issue: http://bugs.python.org/issue15610 . As the fix for this bug is a change to a macro expansion, I guess a simple rebuild of the blender package would fix the problem.