Replace non-standard Python plat env marker (#11035)

Fixes #11034.

diff --git a/pyproject.toml b/pyproject.toml
index 62d07d5fe08a25aa3247b5af14afb3c67ed2607f..bc9e5706ae97e288c897e2ff9dc719ea8f8dd138 100644 (file)
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
     build-backend = "setuptools.build_meta"
     requires = [
         "setuptools>=61.2",
-        "cython>=0.29.24; python_implementation == 'CPython'", # Skip cython when using pypy
+        "cython>=0.29.24; platform_python_implementation == 'CPython'", # Skip cython when using pypy
     ]