Name of Failure:

Installing the minimum gevent version fails on the min-deps tasks of
green-gevent-rhel8. Zero tests run.

Link to task:

https://spruce.corp.mongodb.com/task/mongo_python_driver_green_gevent_rhel8_test_standard_v4.4_python3.11_sync_noauth_nossl_standalone_min_deps_4fb6cc8976794271147c5f60d2146b72a35be10f_26_10_14_21_46_42

Context of when and why the failure occurred:

The variant first ran on 2026-10-09. The task has 0 passing runs of 14 since then. The
gevent version floor resolves to 21.12.0, which predates Python 3.11 and ships no
wheel for it. The install builds from source and fails under the latest Cython. The
same failure hits the v6.0 and v8.0 min-deps tasks of the same version.

Stack trace:

src/gevent/libev/corecext.pyx:60:26: undeclared name not builtin: long
Cython.Compiler.Errors.CompileError: src/gevent/libev/corecext.pyx
hint: `gevent` (v21.12.0) was included because `pymongo:gevent` depends on `gevent`