--- audio/out/ao_coreaudio_exclusive.c.orig
+++ audio/out/ao_coreaudio_exclusive.c
@@ -36,6 +36,8 @@
 
 #include <CoreAudio/HostTime.h>
 
+#include <unistd.h>
+
 #include "config.h"
 #include "ao.h"
 #include "internal.h"