Traceback (most recent call last):
          File "/System/Library/Frameworks/Python.framework/Versions/2.5/Extras/lib/python/twisted/internet/defer.py", line 239, in callback
            self._startRunCallbacks(result)
          File "/System/Library/Frameworks/Python.framework/Versions/2.5/Extras/lib/python/twisted/internet/defer.py", line 304, in _startRunCallbacks
            self._runCallbacks()
          File "/System/Library/Frameworks/Python.framework/Versions/2.5/Extras/lib/python/twisted/internet/defer.py", line 317, in _runCallbacks
            self.result = callback(self.result, *args, **kw)
          File "/Library/Python/2.5/site-packages/buildbot-py2.5.egg/buildbot/process/builder.py", line 805, in _startBuild_2
            d = build.startBuild(bs, self.expectations, sb)
        --- <exception caught here> ---
          File "/Library/Python/2.5/site-packages/buildbot-py2.5.egg/buildbot/process/base.py", line 355, in startBuild
            self.setupBuild(expectations) # create .steps
          File "/Library/Python/2.5/site-packages/buildbot-py2.5.egg/buildbot/process/base.py", line 412, in setupBuild
            step.setDefaultWorkdir(self.workdir)
          File "/Library/Python/2.5/site-packages/buildbot-py2.5.egg/buildbot/steps/shell.py", line 376, in setDefaultWorkdir
            if self.workdir is None:
        exceptions.AttributeError: CustomCompile instance has no attribute 'workdir'