@@ -22,6 +22,9 @@

 #include <windows.h>

 #include <string.h>

 #endif

+#ifndef __plan9__

+#define USED(x) (void)(x)

+#endif

 #pragma GCC diagnostic pop

 #pragma clang diagnostic pop

@@ -157,12 +160,12 @@ audio_callback(void *u, Uint8 *stream, int len)

 {

 	int instance, running = 0;

 	Sint16 *samples = (Sint16 *)stream;

+	USED(u);

 	SDL_memset(stream, 0, len);

 	for(instance = 0; instance < POLYPHONY; instance++)

 		running += audio_render(instance, samples, samples + len / 2);

 	if(!running)

 		SDL_PauseAudioDevice(audio_id, 1);

-	(void)u;

 }

 void

@@ -177,11 +180,11 @@ static int

 stdin_handler(void *p)

 {

 	SDL_Event event;

+	USED(p);

 	event.type = stdin_event;

 	while(read(0, &event.cbutton.button, 1) > 0 && SDL_PushEvent(&event) >= 0)

 		;

 	return 0;

-	(void)p;

 }

 static void

@@ -465,7 +468,6 @@ run(Uxn *u)

 		} else

 			SDL_WaitEvent(NULL);

 	}

-	return error("SDL_WaitEvent", SDL_GetError());

 }

 int