macOS下CMake无法选用正确libpng头文件路径的问题

我正在编译一个依赖libpng的库，该库通过Homebrew安装（版本1.6.44，路径为/opt/homebrew）。使用find_package时，CMake选中了正确的库文件，但头文件却误选了/Library/Frameworks/Mono.framework中的旧版1.4.12。

重命名Mono框架下的Headers子目录可正常编译，但我希望通过配置CMake来指定正确头文件。在调用find_package(PNG 1.6.44 REQUIRED)前，尝试了以下设置，但均无效：

set(CMAKE_IGNORE_PATH /Library/Frameworks/Mono.framework/Headers)
set(CMAKE_IGNORE_PATH /Library/Frameworks/Mono.framework/Headers/libpng14)
set(CMAKE_IGNORE_PREFIX_PATH /Library/Frameworks/Mono.framework)

set(CMAKE_PREFIX_PATH /opt/homebrew)
set(PNG_DIR /opt/homebrew/Cellar/libpng)

CMake仍从/Library/Frameworks/Mono.framework/Headers/libpng14获取头文件，而非/opt/homebrew/include/libpng16。

未调整Mono文件夹时的CMake错误输出 #

CMake Error at /opt/homebrew/Cellar/cmake/3.27.8/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find PNG: Found unsuitable version "1.4.12", but required is at
  least "1.6.44" (found /opt/homebrew/lib/libpng.dylib)
Call Stack (most recent call first):
  /opt/homebrew/Cellar/cmake/3.27.8/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:598 (_FPHSA_FAILURE_MESSAGE)
  /opt/homebrew/Cellar/cmake/3.27.8/share/cmake/Modules/FindPNG.cmake:177 (find_package_handle_standard_args)
  external/irrlicht-sdl2/CMakeLists.txt:18 (find_package)

移动Mono文件夹后，CMake可正常找到Homebrew中的新版libpng。

可行解决方案 #

该Mono相关问题为已知问题，可通过设置set(CMAKE_FIND_FRAMEWORK LAST)解决，该指令让CMake优先查找Homebrew等位置，最后再考虑系统框架（含带旧版libpng的Mono），目前该方案未产生副作用。

内容的提问来源于stack exchange，提问作者pholz