From 1a5c1a68b6a3ffdee2a2ae106af6724eb2d4786a Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 11 Dec 2020 10:53:00 -0500
Subject: macOS: Add /opt/homebrew to CMAKE_SYSTEM_PREFIX_PATH on Apple Silicon

According to https://brew.sh/2020/12/01/homebrew-2.6.0/ the `/opt/homebrew`
directory is recommended for installing ARM architecture brew packages.

Fixes: #21585
---
 Modules/Platform/Darwin.cmake | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Modules/Platform/Darwin.cmake b/Modules/Platform/Darwin.cmake
index c6de3b0..80595ea 100644
--- a/Modules/Platform/Darwin.cmake
+++ b/Modules/Platform/Darwin.cmake
@@ -216,6 +216,13 @@ set(CMAKE_SYSTEM_APPBUNDLE_PATH
 unset(_apps_paths)
 
 include(Platform/UnixPaths)
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
+  list(PREPEND CMAKE_SYSTEM_PREFIX_PATH
+    /opt/homebrew # Brew on Apple Silicon
+    )
+endif()
+
 if(_CMAKE_OSX_SYSROOT_PATH)
   if(EXISTS ${_CMAKE_OSX_SYSROOT_PATH}/usr/include)
     list(INSERT CMAKE_SYSTEM_PREFIX_PATH 0 ${_CMAKE_OSX_SYSROOT_PATH}/usr)
-- 
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