See the inline comment for the explanation.

I have been running into this bug on PyOxidizer when using
Python distributions built against musl libc. For reference:

    $ ldd python/install/bin/python3.7m
         not a dynamic executable

    $ python/install/bin/python3.7m
    Python 3.7.7 (default, Apr  5 2020, 06:02:52)
    [Clang 9.0.1 ] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import ctypes
    >>> ctypes.CDLL(None)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/home/gps/src/pyoxidizer.git/build/python_distributions/python.c1ffa330c730/python/install/lib/python3.7/ctypes/__init__.py", line 364, in __init__
        self._handle = _dlopen(self._name, mode)
    OSError: Dynamic loading not supported

Interestingly, OSError is incomplete (possibly a CPython ctypes bug?):

    >>> try:
    ...     ctypes.CDLL(None)
    ... except OSError as e:
    ...     err = e
    ...
    >>> err
    OSError('Dynamic loading not supported')
    >>> err.errno
    None
    >>> err.strerror
    None
    >>> err.args
    ('Dynamic loading not supported',)