}
#if CLIB_DEBUG > 0
-u32 *vlib_buffer_state_validation_lock;
-uword *vlib_buffer_state_validation_hash;
-void *vlib_buffer_state_heap;
+extern u32 *vlib_buffer_state_validation_lock;
+extern uword *vlib_buffer_state_validation_hash;
+extern void *vlib_buffer_state_heap;
#endif
static inline void