make SDL_syswm.h work with apple's older gcc versions c.f. https://bugzilla.libsdl.org/show_bug.cgi?id=2694
diff --git a/include/SDL_syswm.h b/include/SDL_syswm.h
index d0c19ba..1d15849 100644
--- a/include/SDL_syswm.h
+++ b/include/SDL_syswm.h
@@ -256,8 +256,12 @@ struct SDL_SysWMinfo
#if defined(SDL_VIDEO_DRIVER_COCOA)
struct
{
-#if defined(__OBJC__) && defined(__has_feature) && __has_feature(objc_arc)
+#if defined(__OBJC__) && defined(__has_feature)
+ #if __has_feature(objc_arc)
NSWindow __unsafe_unretained *window; /**< The Cocoa window */
+ #else
+ NSWindow *window; /**< The Cocoa window */
+ #endif
#else
NSWindow *window; /**< The Cocoa window */
#endif
@@ -266,8 +270,12 @@ struct SDL_SysWMinfo
#if defined(SDL_VIDEO_DRIVER_UIKIT)
struct
{
-#if defined(__OBJC__) && defined(__has_feature) && __has_feature(objc_arc)
+#if defined(__OBJC__) && defined(__has_feature)
+ #if __has_feature(objc_arc)
UIWindow __unsafe_unretained *window; /**< The UIKit window */
+ #else
+ UIWindow *window; /**< The UIKit window */
+ #endif
#else
UIWindow *window; /**< The UIKit window */
#endif