From f4b94b1f57827083990272b5f282aa1493ae2bf4 Mon Sep 17 00:00:00 2001
From: Steve Dower <steve.dower@python.org>
Date: Thu, 16 Sep 2021 19:29:32 +0100
Subject: bpo-45220: Avoid automatically selecting the Windows 11 SDK preview
 when building (GH-28393)

---
 Misc/NEWS.d/next/Build/2021-09-16-18-00-43.bpo-45220.TgbkvW.rst | 3 +++
 PCbuild/python.props                                            | 3 +++
 2 files changed, 6 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Build/2021-09-16-18-00-43.bpo-45220.TgbkvW.rst

diff --git a/Misc/NEWS.d/next/Build/2021-09-16-18-00-43.bpo-45220.TgbkvW.rst b/Misc/NEWS.d/next/Build/2021-09-16-18-00-43.bpo-45220.TgbkvW.rst
new file mode 100644
index 0000000..8bbd634
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2021-09-16-18-00-43.bpo-45220.TgbkvW.rst
@@ -0,0 +1,3 @@
+Avoid building with the Windows 11 SDK previews automatically. This may be
+overridden by setting the ``DefaultWindowsSDKVersion`` environment variable
+before building.
diff --git a/PCbuild/python.props b/PCbuild/python.props
index 54dcef0..686d3ff 100644
--- a/PCbuild/python.props
+++ b/PCbuild/python.props
@@ -107,6 +107,9 @@
     <!-- Sometimes the version in the registry has to .0 suffix, and sometimes it doesn't. Check and add it -->
     <_RegistryVersion Condition="$(_RegistryVersion) != '' and !$(_RegistryVersion.EndsWith('.0'))">$(_RegistryVersion).0</_RegistryVersion>
 
+    <!-- Avoid upgrading to Windows 11 SDK for now, but assume the latest Win10 SDK is installed -->
+    <_RegistryVersion Condition="$([System.Version]::Parse($(_RegistryVersion))) >= $([System.Version]::Parse(`10.0.22000.0`))">10.0.19041.0</_RegistryVersion>
+
     <!-- The minimum allowed SDK version to use for building -->
     <DefaultWindowsSDKVersion>10.0.10586.0</DefaultWindowsSDKVersion>
     <DefaultWindowsSDKVersion Condition="$(_RegistryVersion) != '' and $([System.Version]::Parse($(_RegistryVersion))) > $([System.Version]::Parse($(DefaultWindowsSDKVersion)))">$(_RegistryVersion)</DefaultWindowsSDKVersion>
-- 
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