-- Add Cython to the build-system requirements so that the PEP 517 build
-- can regenerate the Cython extension source for Python 3.12 compatibility.

--- pyproject.toml.orig	2026-07-06 16:12:26 UTC
+++ pyproject.toml
@@ -1,2 +1,2 @@
 [build-system]
-requires = ["setuptools", "wheel", "numpy"]
+requires = ["setuptools", "wheel", "numpy", "cython"]