diff -urN aa/libsidplay-1.36.57/src/smart.h libsidplay-1.36.57/src/smart.h
--- aa/libsidplay-1.36.57/src/smart.h	2001-12-29 00:10:17.000000000 +0100
+++ libsidplay-1.36.57/src/smart.h	2004-06-26 18:02:08.684980800 +0200
@@ -223,6 +223,12 @@
             status = false;
         }
     }
+ protected:
+    T* pBufCurrent;
+    T* bufBegin;
+    T* bufEnd;
+    ulint bufLen;
+    bool status;
 };
 
 #endif  /* SIDPLAY1_SMART_H */