--- BDB/BDB.xs	2007/07/08 13:41:03	1.14
+++ BDB/BDB.xs	2007/08/13 11:16:22	1.15
@@ -1075,6 +1075,9 @@
           const_iv (MULTIVERSION)
           const_iv (TXN_SNAPSHOT)
 #endif
+#if DB_VERSION_MINOR >= 6
+          const_iv (DB_PREV_DUP)
+#endif
         };
 
         for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )