NameError for 'orig_meta_prefix' in futurize --stage2

[ceridwen]

I'm trying to get a package (PEAK-Rules) that depends on http://svn.eby-sarna.com/DecoratorTools/ working on Python 3. On test_decorators.py, the stage 2 script crashes with the following traceback:

RefactoringTool: Refactoring ./DecoratorTools/test_decorators.py
Traceback (most recent call last):
File "/usr/local/bin/futurize", line 9, in
load_entry_point('future==0.14.3', 'console_scripts', 'futurize')()
File "/usr/local/lib/python2.7/dist-packages/libfuturize/main.py", line 293, in main
options.processes)
File "/usr/lib/python2.7/lib2to3/refactor.py", line 706, in refactor
items, write, doctests_only)
File "/usr/lib/python2.7/lib2to3/refactor.py", line 301, in refactor
self.refactor_file(dir_or_file, write, doctests_only)
File "/usr/lib/python2.7/lib2to3/refactor.py", line 747, in refactor_file
_args, *_kwargs)
File "/usr/lib/python2.7/lib2to3/refactor.py", line 354, in refactor_file
tree = self.refactor_string(input, filename)
File "/usr/lib/python2.7/lib2to3/refactor.py", line 386, in refactor_string
self.refactor_tree(tree, name)
File "/usr/lib/python2.7/lib2to3/refactor.py", line 460, in refactor_tree
new = fixer.transform(node, results)
File "/usr/local/lib/python2.7/dist-packages/libfuturize/fixes/fix_metaclass.py", line 247, in transform
pass_leaf.prefix = orig_meta_prefix
NameError: global name 'orig_meta_prefix' is not defined