$OpenBSD: patch-src_condvar_h,v 1.1 2017/04/30 08:56:45 espie Exp $
--- src/condvar.h.orig
+++ src/condvar.h
@@ -29,6 +29,7 @@
 ///@note Condition variables work toger with class mutex.
 class condvar
 {
+	typedef dd::mutex mutex;
  protected:
 	struct SDL_cond* cdv;
  private:
