Having MYSQL_VERSION_ID defined correctly made this KILL_QUERY enum item visible. This is a

forwards-incompatible change.

include/mysql_h.ic

@@ -575,6 +575,7 @@ enum mysql_enum_shutdown_level
     SHUTDOWN_WAIT_UPDATES = (unsigned char)((1 << 3)),
     SHUTDOWN_WAIT_ALL_BUFFERS = ((unsigned char)((1 << 3)) << 1),
     SHUTDOWN_WAIT_CRITICAL_BUFFERS = (((unsigned char)((1 << 3)) << 1) + 1),
+    KILL_QUERY = 254,
     KILL_CONNECTION = 255,
   };
 # 154 "mysql.h"