Titanium desktop build on Mac

I'm trying to build a simple desktop application using the tibuild.py file. Here's the command I'm passing:

tibuild.py -v -n -o osx -t bundle -a . -s -d ~/tmp  ~/src/test

When I run this, I get an error saying:

File "/Users/seanoshea/eyefi/svn/manager/ti/build/titanium_desktop/sdk/app.py", line 4, in <module>
import effess
ImportError: No module named effess

I'm just using the stock Python version which comes with Mac OS X:

seanosheas-macbook-pro-2:sdk seanoshea$ python --version
Python 2.6.1
seanosheas-macbook-pro-2:sdk seanoshea$ which pyth开发者_如何转开发on
/usr/bin/python
seanosheas-macbook-pro-2:sdk seanoshea$

Do I have to manually install the Python module effess?

It turns out that I was missing a build artefact called Kroll. effess.py is included in that package, and you just need to pop it in the same directory as the tibuild.py file