-AC_CHECK_LIB([confuse], [cfg_init])
-AC_CHECK_LIB([event_core], [event_get_version])
-AC_CHECK_LIB([freeradius-radius], [rad_alloc])
+AC_CHECK_LIB([confuse], [cfg_init],,
+ AC_MSG_ERROR([required library libconfuse not found]))
+AC_CHECK_LIB([event_core], [event_get_version],,
+ AC_MSG_ERROR([required library libevent_core not found]))
+AC_CHECK_LIB([freeradius-radius], [rad_alloc],,
+ AC_MSG_ERROR([required library libfreeradius-radius not found]))