SDL_cocoaopengl.h: ensure CVDisplayLinkRef is defined The typedef seems to be pulled in coincidentally with newer SDKs, but older ones need to import the header explicitly. (cherry picked from commit d2910904fb4062c313636c7595e971f1bf248075)
diff --git a/src/video/cocoa/SDL_cocoaopengl.h b/src/video/cocoa/SDL_cocoaopengl.h
index 7b900de..fe8a8e5 100644
--- a/src/video/cocoa/SDL_cocoaopengl.h
+++ b/src/video/cocoa/SDL_cocoaopengl.h
@@ -27,6 +27,7 @@
#include "SDL_atomic.h"
#import <Cocoa/Cocoa.h>
+#import <QuartzCore/CVDisplayLink.h>
/* We still support OpenGL as long as Apple offers it, deprecated or not, so disable deprecation warnings about it. */
#ifdef __clang__