+AC_CHECK_DECL([rcu_thread_offline], [],
+ [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu.h>]]
+)
+AC_CHECK_DECL([rcu_thread_online], [],
+ [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu.h>]]
+)