Installation Fails: Missing 'zope-interface' and RuntimeError for GENTLE_RESOURCES_ROOT

[janksmap]

When following these instructions:

git clone https://github.com/lowerquality/gentle.git
cd gentle
./install.sh

everything downloads fine until the very end when I get this error:

error: The 'zope-interface>=5' distribution was not found and is required by twisted

When I run the following command, it breaks.
python3 align.py audio.mp3 words.txt

Traceback (most recent call last):
  File "<user>/gentle/align.py", line 49, in <module>
    resources = gentle.Resources()
  File "<user>/gentle/gentle/resources.py", line 19, in __init__
    require_dir(self.proto_langdir)
  File "<user>/gentle/gentle/resources.py", line 16, in require_dir
    raise RuntimeError("No resource directory %s.  Check %s environment variable?" % (path, ENV_VAR))
RuntimeError: No resource directory <user>/gentle/exp.  Check GENTLE_RESOURCES_ROOT environment variable?

[bd0ug]

Same issue here