From 5c26e3c5e39096d8d9d990a586f6368a33252055 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 14 Feb 2019 07:39:06 -0500
Subject: VS: Fix validation of Windows 8.1 SDK

The check added by commit 0a29a31161 (VS2017: Verify Windows 8.1 SDK
before using it, 2017-04-25, v3.8.1~2^2) used the wrong path to
`windows.h` within the SDK, leading to it never being detected.

Fixes: #18923
---
 Source/cmGlobalVisualStudioVersionedGenerator.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Source/cmGlobalVisualStudioVersionedGenerator.cxx b/Source/cmGlobalVisualStudioVersionedGenerator.cxx
index 12d9304..913fc4a 100644
--- a/Source/cmGlobalVisualStudioVersionedGenerator.cxx
+++ b/Source/cmGlobalVisualStudioVersionedGenerator.cxx
@@ -453,7 +453,8 @@ bool cmGlobalVisualStudioVersionedGenerator::IsWin81SDKInstalled() const
         "HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\"
         "Windows Kits\\Installed Roots;KitsRoot81",
         win81Root, cmSystemTools::KeyWOW64_32)) {
-    return cmSystemTools::FileExists(win81Root + "/um/windows.h", true);
+    return cmSystemTools::FileExists(win81Root + "/include/um/windows.h",
+                                     true);
   }
   return false;
 }
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