From 484791ef0d1a5a2e1228bd81f3ad9a8b049cd67e Mon Sep 17 00:00:00 2001
From: Chuck Walbourn <chuckw@microsoft.com>
Date: Wed, 17 Sep 2025 10:33:56 -0700
Subject: [PATCH] Upgrade to CMake 3.21

---
 CMakeLists.txt    | 2 +-
 CMakePresets.json | 4 ++--
 README.md         | 2 ++
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index adea0ba..2a25c3c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-cmake_minimum_required (VERSION 3.20)
+cmake_minimum_required (VERSION 3.21)
 
 set(FX_VERSION 11.30)
 
diff --git a/CMakePresets.json b/CMakePresets.json
index 29a105e..23ecf69 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -1,5 +1,5 @@
 {
-  "version": 2,
+  "version": 3,
   "configurePresets": [
     {
       "name": "base",
@@ -8,7 +8,7 @@
       "generator": "Ninja",
       "hidden": true,
       "binaryDir": "${sourceDir}/out/build/${presetName}",
-      "cacheVariables": { "CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}" }
+      "installDir": "${sourceDir}/out/install/${presetName}"
     },
 
     {
diff --git a/README.md b/README.md
index 0a6a9e2..a0ed495 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ FOR SECURITY ADVISORIES, see [GitHub](https://github.com/microsoft/FX11/security
 
 For a full change history, see [CHANGELOG.md](https://github.com/microsoft/FX11/blob/main/CHANGELOG.md).
 
+* The CMake projects require 3.21 or later. VS 2019 users will need to install a standalone version of CMake 3.21 or later and add it to their PATH.
+
 * The library can be built with Visual C++ or with clang/LLVM for Windows. The code is not conformant enough to support the GNUC (MinGW) compiler.
 
 ## Support