--- a/include/SDL_platform.h	Tue Feb 21 09:11:53 2006 +0000
+++ b/include/SDL_platform.h	Tue Feb 21 09:14:58 2006 +0000
@@ -22,6 +22,9 @@
 
 /* Try to get a standard set of platform defines */
 
+#ifndef _SDL_platform_h
+#define _SDL_platform_h
+
 #if defined(_AIX)
 #undef __AIX__
 #define __AIX__		1
@@ -102,3 +105,5 @@
 #undef __WIN32__
 #define __WIN32__	1
 #endif
+
+#endif /* _SDL_platform_h */

--- a/src/audio/SDL_audio.c	Tue Feb 21 09:11:53 2006 +0000
+++ b/src/audio/SDL_audio.c	Tue Feb 21 09:14:58 2006 +0000
@@ -436,7 +436,7 @@
 	audio->enabled = 1;
 	audio->paused  = 1;
 
-#if SDL_AUDIO_DRIVER_AHI
+#if !SDL_AUDIO_DRIVER_AHI
 
 /* AmigaOS opens audio inside the main loop */
 	audio->opened = audio->OpenAudio(audio, &audio->spec)+1;
@@ -511,7 +511,7 @@
 		}
 	}
 
-#if SDL_AUDIO_DRIVER_AHI
+#if !SDL_AUDIO_DRIVER_AHI
 	/* Start the audio thread if necessary */
 	switch (audio->opened) {
 		case  1:
@@ -611,7 +611,7 @@
 			SDL_FreeAudioMem(audio->convert.buf);
 
 		}
-#if SDL_AUDIO_DRIVER_AHI
+#if !SDL_AUDIO_DRIVER_AHI
 		if ( audio->opened ) {
 			audio->CloseAudio(audio);
 			audio->opened = 0;