Pypy3.9 scikit-learn problem

Technical Topics
1

I created a pypy3.9 environment and did an install of

conda install -c conda-forge sympy

I also installed numpy, scipy, matplotlib, and scikit-learn with no errors.

If I try to import sklearn using pypy3.9, I get

Traceback (most recent call last):
  File "/home/doug/anaconda3/envs/pypy3.9/lib/pypy3.9/site-packages/sklearn/__check_build/__init__.py", line 48, in <module>
    from ._check_build import check_build  # noqa
ModuleNotFoundError: No module named 'sklearn.__check_build._check_build'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "testImports.py", line 5, in <module>
    import sklearn
  File "/home/doug/anaconda3/envs/pypy3.9/lib/pypy3.9/site-packages/sklearn/__init__.py", line 81, in <module>
    from . import __check_build  # noqa: F401
  File "/home/doug/anaconda3/envs/pypy3.9/lib/pypy3.9/site-packages/sklearn/__check_build/__init__.py", line 50, in <module>
    raise_build_error(e)
  File "/home/doug/anaconda3/envs/pypy3.9/lib/pypy3.9/site-packages/sklearn/__check_build/__init__.py", line 31, in raise_build_error
    raise ImportError(
ImportError: No module named 'sklearn.__check_build._check_build'
___________________________________________________________________________
Contents of /home/doug/anaconda3/envs/pypy3.9/lib/pypy3.9/site-packages/sklearn/__check_build:
setup.py                  __init__.py               __pycache__
_check_build.cpython-39-x86_64-linux-gnu.so
___________________________________________________________________________
It seems that scikit-learn has not been built correctly.

If you have installed scikit-learn from source, please do not forget
to build the package before using it: run `python setup.py install` or
`make` in the source directory.

If you have used an installer, please check that it is suited for your
Python version, your operating system and your platform.
(pypy3.9) ~/python3$

Under the base environment, using python the testImports.py runs fine.