Traceback (most recent call last):
  File "wdb_example.py", line 31, in <module>
    from brlcad.primitives import union
  File "/usr/local/lib/python2.7/site-packages/brlcad-0.0.1-py2.7.egg/brlcad/primitives/__init__.py", line 8, in <module>
    from combination import Combination, negate, intersect, subtract, union, xor, wrap_tree, leaf
  File "/usr/local/lib/python2.7/site-packages/brlcad-0.0.1-py2.7.egg/brlcad/primitives/combination.py", line 290, in <module>
    class UnionNode(SymmetricNode):
  File "/usr/local/lib/python2.7/site-packages/brlcad-0.0.1-py2.7.egg/brlcad/primitives/combination.py", line 292, in UnionNode
    op_code = librt.OP_UNION
AttributeError: 'module' object has no attribute 'OP_UNION'