Index: src/Acquisition/_Acquisition.c
===================================================================
--- src/Acquisition/_Acquisition.c	(revision 105930)
+++ src/Acquisition/_Acquisition.c	(working copy)
@@ -1333,6 +1333,9 @@
   /* tp_flags          */ Py_TPFLAGS_DEFAULT 
                           | Py_TPFLAGS_BASETYPE
                           | Py_TPFLAGS_HAVE_GC
+#ifdef Py_TPFLAGS_HAVE_VERSION_TAG
+                          | Py_TPFLAGS_HAVE_VERSION_TAG
+#endif
                           ,
   "Wrapper object for implicit acquisition", /* Documentation string */
   /* tp_traverse       */ (traverseproc)Wrapper_traverse,
@@ -1377,6 +1380,9 @@
   /* tp_flags          */ Py_TPFLAGS_DEFAULT 
                           | Py_TPFLAGS_BASETYPE
                           | Py_TPFLAGS_HAVE_GC
+#ifdef Py_TPFLAGS_HAVE_VERSION_TAG
+                          | Py_TPFLAGS_HAVE_VERSION_TAG
+#endif
                           ,
   "Wrapper object for implicit acquisition", /* Documentation string */
   /* tp_traverse       */ (traverseproc)Wrapper_traverse,