wayland: Check for both _WAYLAND_CLIENT_H and WAYLAND_CLIENT_H
diff --git a/src/video/wayland/SDL_waylanddyn.h b/src/video/wayland/SDL_waylanddyn.h
index dc5e619..63b831f 100644
--- a/src/video/wayland/SDL_waylanddyn.h
+++ b/src/video/wayland/SDL_waylanddyn.h
@@ -64,7 +64,7 @@ void SDL_WAYLAND_UnloadSymbols(void);
#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
-#ifdef _WAYLAND_CLIENT_H
+#if defined(_WAYLAND_CLIENT_H) || defined(WAYLAND_CLIENT_H)
#error Do not include wayland-client ahead of SDL_waylanddyn.h in dynamic loading mode
#endif