essentia installs fine, but gaia fails

[r3a1d3a1]

No matter I run brew install gaia --HEAD or brew install essentia --HEAD --with-gaia, I get the following error:

==> python2 -c import setuptools... --no-user-cfg install --prefix=/private/tmp/gaia--homebrew-virtualenv-20200404-13
==> python2 -s /private/tmp/gaia--homebrew-virtualenv-20200404-13972-1k2ggub/target/bin/virtualenv -p python2 /usr/lo
Last 15 lines from /Users/r3a1d3a1/Library/Logs/Homebrew/gaia/02.python2:
  File "/private/tmp/gaia--homebrew-virtualenv-20200404-13972-1k2ggub/target/lib/python2.7/site-packages/virtualenv.py", line 1019, in install_wheel
    _install_wheel_with_search_dir(download, project_names, py_executable, search_dirs)
  File "/private/tmp/gaia--homebrew-virtualenv-20200404-13972-1k2ggub/target/lib/python2.7/site-packages/virtualenv.py", line 1046, in _install_wheel_with_search_dir
    config = _pip_config(py_executable, python_path)
  File "/private/tmp/gaia--homebrew-virtualenv-20200404-13972-1k2ggub/target/lib/python2.7/site-packages/virtualenv.py", line 1128, in _pip_config
    config[key] = ast.literal_eval(value)
  File "/usr/local/Cellar/python@2/2.7.15_3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ast.py", line 49, in literal_eval
    node_or_string = parse(node_or_string, mode='eval')
  File "/usr/local/Cellar/python@2/2.7.15_3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ast.py", line 37, in parse
    return compile(source, filename, mode, PyCF_ONLY_AST)
  File "<unknown>", line 1
    __get_hash(__func_name)
    ^
IndentationError: unexpected indent
Running virtualenv with interpreter /usr/local/opt/python@2/bin/python2

If reporting this issue please do so at (not Homebrew/brew or Homebrew/core):
  https://github.com/mtg/homebrew-essentia/issues