--- CMakeLists.txt.orig	2020-11-05 16:48:40.000000000 -0800
+++ CMakeLists.txt	2020-11-05 16:49:02.000000000 -0800
@@ -1701,7 +1701,7 @@
 
     if(VIDEO_VULKAN OR VIDEO_METAL OR RENDER_METAL)
       set(ORIG_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-      set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -x objective-c")
+      set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -ObjC")
       check_c_source_compiles("
         #include <AvailabilityMacros.h>
         #import <Metal/Metal.h>