ModuleNotFoundError: No module named 'copulae.special._specfunc' about copulae HOT 2 CLOSED

$ git clone https://github.com/DanielBok/copulae.git
$ cd copulae
$ pip install -r build-requirements.txt
$ pip install .
$ python -c "import copulae"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/__init__.py", line 1, in <module>
    from copulae.archimedean import *
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/archimedean/__init__.py", line 1, in <module>
    from .clayton import ClaytonCopula
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/archimedean/clayton.py", line 4, in <module>
    from copulae.copula import Summary, TailDep
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/copula/__init__.py", line 1, in <module>
    from .base import *
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/copula/base.py", line 8, in <module>
    from copulae.copula.estimator import EstimationMethod, fit_copula
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/copula/estimator/__init__.py", line 1, in <module>
    from .estimator import fit_copula, EstimationMethod
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/copula/estimator/estimator.py", line 8, in <module>
    from copulae.stats import pearson_rho
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/stats/__init__.py", line 3, in <module>
    from .stable.stable import skew_stable
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/stats/stable/stable.py", line 7, in <module>
    from copulae.special.trig import tanpi2
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/special/__init__.py", line 2, in <module>
    from .special_func import *
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/special/special_func.py", line 7, in <module>
    from copulae.special.dilog import dilog, dilog_complex
  File "/Users/cmarsh/Documents/science/code/copulae/copulae/special/dilog.py", line 3, in <module>
    from ._specfunc import dilog as _dilog, dilog_complex as _dilog_complex
ModuleNotFoundError: No module named 'copulae.special._specfunc'

$ python setup.py bdist_wheel
$ cd dist
$ pip install copulae-0.7.7-cp310-cp310-macosx_12_0_arm64.whl
$ python -c "import copulae"