I tried to compile numpy with python3.8 alpha 4 and Cython master and still fails:

~/github/numpy master ✔
❯ ~/github/cpython/python.exe --version
Python 3.8.0a4

~/github/numpy master ✔
❯ ~/github/cpython/python.exe -m pip freeze
/Users/pgalindo3/.local/lib/python3.8/site-packages/pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
  from collections import Mapping
Cython==3.0a0


~/github/numpy master ✔
❯ ~/github/cpython/python.exe -m pip install . --user
       generate_cython()
      File "/private/var/folders/sw/ml9tlhsx7hd7sdqpnlzhrxxh0000gr/T/pip-req-build-vposbe_c/setup.py", line 234, in generate_cython
        raise RuntimeError("Running cythonize failed!")
    RuntimeError: Running cythonize failed!

    ----------------------------------------
Command "/Users/pgalindo3/github/cpython/python.exe -u -c "import setuptools, tokenize;__file__='/private/var/folders/sw/ml9tlhsx7hd7sdqpnlzhrxxh0000gr/T/pip-req-build-vposbe_c/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/sw/ml9tlhsx7hd7sdqpnlzhrxxh0000gr/T/pip-record-9l43u38y/install-record.txt --single-version-externally-managed --compile --user --prefix=" failed with error code 1 in /private/var/folders/sw/ml9tlhsx7hd7sdqpnlzhrxxh0000gr/T/pip-req-build-vposbe_c/