ImportError: No module named waflib.Build

[xevix]

Something seems wrong with "waf". Am I missing something? Running OS X 10.7, Python 3.1.

$ python3 ./wscript configure --prefix=/usr
Traceback (most recent call last):
File "./wscript", line 3, in
from waflib.Build import BuildContext
ImportError: No module named waflib.Build

[xevix]

Ah sorry, was supposed to be "waf" not "wscript" my bad.