import new p4a

venv/lib/python3.8/site-packages/Cython/Distutils/build_ext.py

@@ -0,0 +1,25 @@
+import sys
+
+if 'setuptools' in sys.modules:
+    try:
+        from setuptools.command.build_ext import build_ext as _build_ext
+    except ImportError:
+        # We may be in the process of importing setuptools, which tries
+        # to import this.
+        from distutils.command.build_ext import build_ext as _build_ext
+else:
+    from distutils.command.build_ext import build_ext as _build_ext
+
+
+class new_build_ext(_build_ext, object):
+    def finalize_options(self):
+        if self.distribution.ext_modules:
+            nthreads = getattr(self, 'parallel', None)  # -j option in Py3.5+
+            nthreads = int(nthreads) if nthreads else None
+            from Cython.Build.Dependencies import cythonize
+            self.distribution.ext_modules[:] = cythonize(
+                self.distribution.ext_modules, nthreads=nthreads, force=self.force)
+        super(new_build_ext, self).finalize_options()
+
+# This will become new_build_ext in the future.
+from .old_build_ext import old_build_ext as build_ext