diff -p -up apr-1.4.2/include/apr_ring.h.orig apr-1.4.2/include/apr_ring.h
--- apr-1.4.2/include/apr_ring.h.orig	2010-12-01 17:34:25.278706979 -0200
+++ apr-1.4.2/include/apr_ring.h	2010-12-01 17:34:59.454706961 -0200
@@ -90,8 +90,8 @@
  */
 #define APR_RING_HEAD(head, elem)					\
     struct head {							\
-	struct elem *next;						\
-	struct elem *prev;						\
+	struct elem * volatile next;					\
+	struct elem * volatile prev;					\
     }
 
 /**