d3d8/d3d9: Define D3D_SDK_VERSION.
diff --git a/include/d3d9.h b/include/d3d9.h
index b4e23ce..e7abb54 100644
--- a/include/d3d9.h
+++ b/include/d3d9.h
@@ -50,6 +50,7 @@
 /*****************************************************************************
  * #defines and error codes
  */
+#define D3D_SDK_VERSION                         32
 #define D3DADAPTER_DEFAULT                      0
 #define D3DENUM_NO_WHQL_LEVEL                   0x00000002L
 #define D3DPRESENT_BACK_BUFFERS_MAX             3L