text/en/en-model.slp not being included during build

causes the following error:
File "/usr/local/lib/python2.7/dist-packages/pattern/text/en/__init__.py", line 54, in <module>
    from pattern.text.en.inflect import (
  File "/usr/local/lib/python2.7/dist-packages/pattern/text/en/__init__.py", line 129, in <module>
    language = "en"
  File "/usr/local/lib/python2.7/dist-packages/pattern/text/__init__.py", line 654, in __init__
    self.model = Model(path=model)
  File "/usr/local/lib/python2.7/dist-packages/pattern/text/__init__.py", line 258, in __init__
    self._classifier = Classifier.load(path) if path else classifier or Perceptron()
  File "/usr/local/lib/python2.7/dist-packages/pattern/vector/__init__.py", line 1984, in load
    f = gzip.GzipFile(path, "rb")
  File "/usr/lib/python2.7/gzip.py", line 89, in __init__
    fileobj = self.myfileobj = __builtin__.open(filename, mode or 'rb')
IOError: [Errno 2] No such file or directory: '/usr/local/lib/python2.7/dist-packages/pattern/text/en/en-model.slp'