https://trac.macports.org/ticket/67263

--- lib/graphics_engine/include/vk_mvk_moltenvk.h.orig
+++ lib/graphics_engine/include/vk_mvk_moltenvk.h
@@ -26,12 +26,11 @@
 extern "C" {
 #endif	//  __cplusplus
 	
-#include <IOSurface/IOSurfaceRef.h>
-
 #ifdef __OBJC__
 #import <Metal/Metal.h>
 #else
 typedef unsigned long MTLLanguageVersion;
+typedef void *IOSurfaceRef;
 #endif