Need cython < 3 right now.

e3d7128d · Jason Madden · 2f3c39db · e3d7128d
Commit e3d7128d authored May 01, 2020 by Jason Madden
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pyproject.toml pyproject.toml +3 -2

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--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,8 +13,9 @@ requires = [
     # name to be created so that we can have both foo.py and _foo.so
     # at the same time. 0.29 fixes some issues with Python 3.7,
     # and adds the 3str mode for transition to Python 3. 0.29.14+ is
-     # required for Python 3.8
+     # required for Python 3.8. As of now, we can't build with Cython 3.0a3
-     "Cython >= 0.29.14",
+     # https://github.com/gevent/gevent/issues/1599
+     "Cython >= 0.29.14, < 3",
     # See version requirements in setup.py
     "cffi >= 1.12.3 ; platform_python_implementation == 'CPython'",
     # Python 3.7 requires at least 0.4.14, which is ABI incompatible with earlier