Index: setup.py
===================================================================
--- setup.py	(revision 74955)
+++ setup.py	(working copy)
@@ -695,7 +695,7 @@
         # a release.  Most open source OSes come with one or more
         # versions of BerkeleyDB already installed.
 
-        max_db_ver = (4, 7)
+        max_db_ver = (4, 8)
         min_db_ver = (3, 3)
         db_setup_debug = False   # verbose debug prints from this script?
 
Index: Modules/_bsddb.c
===================================================================
--- Modules/_bsddb.c	(revision 74955)
+++ Modules/_bsddb.c	(working copy)
@@ -215,7 +215,11 @@
 #define	DB_BUFFER_SMALL		ENOMEM
 #endif
 
+#if (DBVER < 48)
+#define DB_GID_SIZE DB_XIDDATASIZE
+#endif
 
+
 /* --------------------------------------------------------------------- */
 /* Structure definitions */
 
@@ -4501,7 +4505,11 @@
     DBTxnObject *txn;
 #define PREPLIST_LEN 16
     DB_PREPLIST preplist[PREPLIST_LEN];
+#if (DBVER < 48)
     long retp;
+#else
+    u_int32_t retp;
+#endif
 
     CHECK_ENV_NOT_CLOSED(self);
 
@@ -4522,7 +4530,7 @@
         flags=DB_NEXT;  /* Prepare for next loop pass */
         for (i=0; i<retp; i++) {
             gid=PyBytes_FromStringAndSize((char *)(preplist[i].gid),
-                                DB_XIDDATASIZE);
+                                DB_GID_SIZE);
             if (!gid) {
                 Py_DECREF(list);
                 return NULL;
@@ -5047,6 +5055,7 @@
 }
 
 
+#if (DBVER < 48)
 static PyObject*
 DBEnv_set_rpc_server(DBEnvObject* self, PyObject* args, PyObject* kwargs)
 {
@@ -5068,6 +5077,7 @@
     RETURN_IF_ERR();
     RETURN_NONE();
 }
+#endif
 
 static PyObject*
 DBEnv_set_verbose(DBEnvObject* self, PyObject* args)
@@ -5947,9 +5957,9 @@
     if (!PyArg_ParseTuple(args, "s#:prepare", &gid, &gid_size))
         return NULL;
 
-    if (gid_size != DB_XIDDATASIZE) {
+    if (gid_size != DB_GID_SIZE) {
         PyErr_SetString(PyExc_TypeError,
-                        "gid must be DB_XIDDATASIZE bytes long");
+                        "gid must be DB_GID_SIZE bytes long");
         return NULL;
     }
 
@@ -6539,8 +6549,10 @@
 #endif
     {"set_get_returns_none",(PyCFunction)DBEnv_set_get_returns_none, METH_VARARGS},
     {"txn_recover",     (PyCFunction)DBEnv_txn_recover,       METH_NOARGS},
+#if (DBVER < 48)
     {"set_rpc_server",  (PyCFunction)DBEnv_set_rpc_server,
         METH_VARARGS||METH_KEYWORDS},
+#endif
     {"set_verbose",     (PyCFunction)DBEnv_set_verbose,       METH_VARARGS},
 #if (DBVER >= 42)
     {"get_verbose",     (PyCFunction)DBEnv_get_verbose,       METH_VARARGS},
@@ -7089,6 +7101,7 @@
     ADD_INT(d, DB_MAX_PAGES);
     ADD_INT(d, DB_MAX_RECORDS);
 
+#if (DBVER < 48)
 #if (DBVER >= 42)
     ADD_INT(d, DB_RPCCLIENT);
 #else
@@ -7096,7 +7109,11 @@
     /* allow apps to be written using DB_RPCCLIENT on older Berkeley DB */
     _addIntToDict(d, "DB_RPCCLIENT", DB_CLIENT);
 #endif
+#endif
+
+#if (DBVER < 48)
     ADD_INT(d, DB_XA_CREATE);
+#endif
 
     ADD_INT(d, DB_CREATE);
     ADD_INT(d, DB_NOMMAP);
@@ -7113,7 +7130,13 @@
     ADD_INT(d, DB_INIT_TXN);
     ADD_INT(d, DB_JOINENV);
 
+#if (DBVER >= 48)
+    ADD_INT(d, DB_GID_SIZE);
+#else
     ADD_INT(d, DB_XIDDATASIZE);
+    /* Allow new code to work in old BDB releases */
+    _addIntToDict(d, "DB_GID_SIZE", DB_XIDDATASIZE);
+#endif
 
     ADD_INT(d, DB_RECOVER);
     ADD_INT(d, DB_RECOVER_FATAL);