Include SDL_hints.h.
diff --git a/src/thread/pthread/SDL_systhread.c b/src/thread/pthread/SDL_systhread.c
index 73a0120..700c0a5 100644
--- a/src/thread/pthread/SDL_systhread.c
+++ b/src/thread/pthread/SDL_systhread.c
@@ -21,7 +21,7 @@
#include "../../SDL_internal.h"
#include "SDL_system.h"
-#include "SDL_hint.h"
+#include "SDL_hints.h"
#include <pthread.h>