diff -crB apr-1.4.2-orig/include/apr_ring.h apr-1.4.2/include/apr_ring.h
*** apr-1.4.2-orig/include/apr_ring.h	2011-02-16 14:00:19.326000089 +0300
--- apr-1.4.2/include/apr_ring.h	2011-02-16 14:02:42.378000091 +0300
***************
*** 90,97 ****
   */
  #define APR_RING_HEAD(head, elem)					\
      struct head {							\
! 	struct elem *next;						\
! 	struct elem *prev;						\
      }
  
  /**
--- 90,97 ----
   */
  #define APR_RING_HEAD(head, elem)					\
      struct head {							\
! 	struct elem * volatile next;					\
! 	struct elem * volatile prev;					\
      }
  
  /**