From da07c8ad2afe1f96cdc54d1827b6bb01fdef75d9 Mon Sep 17 00:00:00 2001
From: Alexander Grund <github@grundis.de>
Date: Thu, 2 Jan 2025 08:17:22 -0500
Subject: [PATCH] macOS: Detect homebrew prefix from brew tool

Although not recommended by homebrew, users can install it in a
non-standard prefix.  Ask `brew --prefix` before using defaults.
---
 Modules/Platform/Darwin.cmake | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/Modules/Platform/Darwin.cmake b/Modules/Platform/Darwin.cmake
index f334c5f5cd..c34e2717f0 100644
--- a/Modules/Platform/Darwin.cmake
+++ b/Modules/Platform/Darwin.cmake
@@ -248,10 +248,26 @@ 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
-    )
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  execute_process(
+    COMMAND brew --prefix
+    OUTPUT_VARIABLE _cmake_homebrew_prefix
+    RESULT_VARIABLE _brew_result
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+  )
+  if (_brew_result EQUAL 0 AND IS_DIRECTORY "${_cmake_homebrew_prefix}")
+    list(PREPEND CMAKE_SYSTEM_PREFIX_PATH "${_cmake_homebrew_prefix}")
+  elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
+    list(PREPEND CMAKE_SYSTEM_PREFIX_PATH
+      /opt/homebrew # Brew on Apple Silicon
+      )
+  else()
+    list(PREPEND CMAKE_SYSTEM_PREFIX_PATH
+      /usr/local # Brew on Intel
+      )
+  endif()
+  unset(_cmake_homebrew_prefix)
+  unset(_brew_result)
 endif()
 
 if(_CMAKE_OSX_SYSROOT_PATH)