IsEqualGUID is defined in 'include/wine/obj_base.h'. All other
declarations must surrender or prepare to be met with deadly force :-)

diff --git a/multimedia/dplay.c b/multimedia/dplay.c
index 281824a..7d180aa 100644
--- a/multimedia/dplay.c
+++ b/multimedia/dplay.c
@@ -14,10 +14,6 @@
 
 #include "thread.h"
 
-#define IsEqualGUID(rguid1, rguid2) (!memcmp(rguid1, rguid2, sizeof(GUID)))
-#define IsEqualIID(riid1, riid2) IsEqualGUID(riid1, riid2)
-#define IsEqualCLSID(rclsid1, rclsid2) IsEqualGUID(rclsid1, rclsid2)
-
 struct IDirectPlayLobby {
     LPDIRECTPLAYLOBBY_VTABLE lpVtbl;
     ULONG                    ref;
diff --git a/ole/oleobj.c b/ole/oleobj.c
index cc4427d..738ebd3 100644
--- a/ole/oleobj.c
+++ b/ole/oleobj.c
@@ -17,11 +17,6 @@
 #include "debug.h"
 
 
-#define IsEqualGUID(rguid1, rguid2) (!memcmp(rguid1, rguid2, sizeof(GUID)))
-#define IsEqualIID(riid1, riid2) IsEqualGUID(riid1, riid2)
-#define IsEqualCLSID(rclsid1, rclsid2) IsEqualGUID(rclsid1, rclsid2)
-
-
 /**************************************************************************
  *  IOleAdviseHolder Implementation
  */