--- a/src/audio/SDL_sysaudio.h	Sat Mar 30 18:53:23 2002 +0000
+++ b/src/audio/SDL_sysaudio.h	Sat Mar 30 19:48:56 2002 +0000
@@ -59,6 +59,11 @@
 	void (*CloseAudio)(_THIS);
 
 	/* * * */
+	/* Lock / Unlock functions added for the Mac port */
+	void (*LockAudio)(_THIS);
+	void (*UnlockAudio)(_THIS);
+
+	/* * * */
 	/* Data common to all devices */
 
 	/* The current audio specification (shared with audio thread) */