Choose version of Xcode to use during the build. (#2157)

docs/ios/cli.md

@@ -27,6 +27,8 @@ In this tutorial, you'll learn how to create and run a .NET Multi-platform App U
 
 <!-- markdownlint-enable MD029 -->
 
+[!INCLUDE [choose Xcode version](~/macios/includes/choose-xcode-version.md)]
+
 ## Launch the app on a specific simulator
 
 A .NET MAUI iOS app can be launched on a specific iOS simulator from a Mac by providing its unique device id (UDID):

docs/mac-catalyst/cli.md

@@ -32,3 +32,5 @@ In this tutorial, you'll learn how to create and run a .NET Multi-platform App U
     :::image type="content" source="media/cli/maccatalyst-running-app.png" alt-text=".NET MAUI app running on Mac.":::
 
 <!-- markdownlint-enable MD029 -->
+
+[!INCLUDE [choose Xcode version](~/macios/includes/choose-xcode-version.md)]

docs/macios/includes/choose-xcode-version.md

@@ -0,0 +1,22 @@
+---
+ms.topic: include
+ms.date: 03/19/2024
+---
+
+## Build with a specific version of Xcode
+
+If you have multiple versions of Xcode installed on your Mac, it's possible to specify which Xcode version should be used when building your app. There are a number of approaches that can be used to accomplish this, but the recommended approach is to set the `MD_APPLE_SDK_ROOT` environment variable to the path of the Xcode version.
+
+> [!WARNING]
+> Using `xcode-select -s` to set the version of Xcode to use isn't recommended.
+
+To set the `MD_APPLE_SDK_ROOT` environment variable for the duration of the current terminal session:
+
+1. Open the **Terminal** application.
+1. Type the following command, substituting in your version of Xcode, and press Enter:
+
+    ```zsh
+    export MD_APPLE_SDK_ROOT=/Applications/Xcode_14.1.0.app
+    ```
+
+If you want to set this environment variable permanently, you can add the `export` command to your shell profile, such as *.zprofile*.