MAC_OS_X_VERSION_MAX_REQUIRED isn't actually set in recent Xcode versions
diff --git a/include/SDL_config_macosx.h b/include/SDL_config_macosx.h
index 1951b09..476ef4a 100644
--- a/include/SDL_config_macosx.h
+++ b/include/SDL_config_macosx.h
@@ -176,7 +176,7 @@
/* Enable Vulkan support */
/* Metal/MoltenVK/Vulkan only supported on 64-bit architectures with 10.11+ */
-#if TARGET_CPU_X86_64 && (MAC_OS_X_VERSION_MAX_REQUIRED >= 101100)
+#if TARGET_CPU_X86_64
#define SDL_VIDEO_VULKAN 1
#else
#define SDL_VIDEO_VULKAN 0