--- sql/conn_handler/socket_connection.cc.orig	2018-04-08 06:44:49 UTC
+++ sql/conn_handler/socket_connection.cc
@@ -810,20 +810,24 @@ Channel_info *Mysqld_socket_listener::li
     signal(SIGCHLD, SIG_DFL);
     request_init(&req, RQ_DAEMON, m_libwrap_name, RQ_FILE,
                  mysql_socket_getfd(connect_sock), NULL);
-    fromhost(&req);
+    void (*my_fromhost) (void *) = (void (*)(void *)) fromhost;
+    my_fromhost(&req);
 
-    if (!hosts_access(&req)) {
+    int (*my_hosts_access) (void *) = (int (*) (void *)) hosts_access;
+    if (!my_hosts_access(&req)) {
       /*
         This may be stupid but refuse() includes an exit(0)
         which we surely don't want...
         clean_exit() - same stupid thing ...
       */
+      char *(*my_eval_client) (void *) = (char *(*) (void *)) eval_client;
       syslog(LOG_AUTH | m_deny_severity, "refused connect from %s",
-             eval_client(&req));
+             my_eval_client(&req));
 
 #ifdef HAVE_LIBWRAP_PROTOTYPES
       // Some distros have patched tcpd.h to have proper prototypes
-      if (req.sink) (req.sink)(req.fd);
+      if (req.sink) ((void (*)(int)) (req.sink))(req.fd);
+
 #else
       // Some distros have not patched tcpd.h
       if (req.sink) ((void (*)(int))req.sink)(req.fd);