diff -ruN DXSDK/include.orig/dsound.h DXSDK/include/dsound.h
--- DXSDK/include.orig/dsound.h	2002-08-06 18:56:34.000000000 +0900
+++ DXSDK/include/dsound.h	2002-08-06 19:06:32.000000000 +0900
@@ -1896,7 +1896,7 @@
 struct IDirectSoundFullDuplex;
 #endif // __cplusplus
 
-typedef struct IDirectSoundFullDuplex *LPDIRECTSOUNDFULLDUPLEX;
+//typedef struct IDirectSoundFullDuplex *LPDIRECTSOUNDFULLDUPLEX;
 
 DEFINE_GUID(IID_IDirectSoundFullDuplex, 0xedcb4c7a, 0xdaab, 0x4216, 0xa4, 0x2e, 0x6c, 0x50, 0x59, 0x6d, 0xdc, 0x1d);