url: patched to compile on macOS.
diff --git a/src/misc/macosx/SDL_sysurl.m b/src/misc/macosx/SDL_sysurl.m
index 18324e3..80247f3 100644
--- a/src/misc/macosx/SDL_sysurl.m
+++ b/src/misc/macosx/SDL_sysurl.m
@@ -21,6 +21,8 @@
#include "../../SDL_internal.h"
+#import <Cocoa/Cocoa.h>
+
int
SDL_SYS_OpenURL(const char *url)
{ @autoreleasepool