Fixed rtkit feature guard
diff --git a/src/core/linux/SDL_threadprio.c b/src/core/linux/SDL_threadprio.c
index a09c1cf..05785b8 100644
--- a/src/core/linux/SDL_threadprio.c
+++ b/src/core/linux/SDL_threadprio.c
@@ -30,8 +30,9 @@
#include <pthread.h>
#include "SDL_system.h"
-#if HAVE_DBUS_DBUS_H
#include "SDL_dbus.h"
+
+#if SDL_USE_LIBDBUS
/* d-bus queries to org.freedesktop.RealtimeKit1. */
#define RTKIT_DBUS_NODE "org.freedesktop.RealtimeKit1"
#define RTKIT_DBUS_PATH "/org/freedesktop/RealtimeKit1"