diff --git a/build_scripts/build_utils.py b/build_scripts/build_utils.py
index 79ed5ea6d..38ac286e8 100644
--- a/build_scripts/build_utils.py
+++ b/build_scripts/build_utils.py
@@ -153,6 +153,7 @@ def run_cmake(force_clean=False, log_output=False, debug_build=False):
       "-G",
       "Ninja",
       f"-DPython_ADDITIONAL_VERSIONS={current_config.py_version}",
+      "-DCMAKE_POLICY_VERSION_MINIMUM=3.16",
   ]
   if debug_build:
     cmd.append("-DCMAKE_BUILD_TYPE=Debug")
diff --git a/pytype/overlays/functools_overlay.py b/pytype/overlays/functools_overlay.py
index 891258336..444aec286 100644
--- a/pytype/overlays/functools_overlay.py
+++ b/pytype/overlays/functools_overlay.py
@@ -4,7 +4,7 @@
 
 from collections.abc import Mapping, Sequence
 import threading
-from typing import Any, Self, TYPE_CHECKING
+from typing import Any, TYPE_CHECKING
 
 from pytype.abstract import abstract
 from pytype.abstract import function
@@ -12,6 +12,7 @@
 from pytype.overlays import overlay
 from pytype.overlays import special_builtins
 from pytype.typegraph import cfg
+from typing_extensions import Self
 
 if TYPE_CHECKING:
   from pytype import context  # pylint: disable=g-import-not-at-top