client/mysql.cc

    mysql default port cleanup (it's set in libmysql.c, NOT in my_getopt)
configure.in
    autoconf 2.52 is enough to build mysql-5.0

client/mysql.cc

@@ -624,7 +624,7 @@ static struct my_option my_long_options[] =
    NO_ARG, 0, 0, 0, 0, 0, 0},
 #endif
   {"port", 'P', "Port number to use for connection.", (gptr*) &opt_mysql_port,
-   (gptr*) &opt_mysql_port, 0, GET_UINT, REQUIRED_ARG, MYSQL_PORT, 0, 0, 0, 0,
+   (gptr*) &opt_mysql_port, 0, GET_UINT, REQUIRED_ARG, 0, 0, 0, 0, 0,
    0},
   {"prompt", OPT_PROMPT, "Set the mysql prompt to this value.",
    (gptr*) &current_prompt, (gptr*) &current_prompt, 0, GET_STR_ALLOC,

configure.in

 dnl -*- ksh -*-
 dnl Process this file with autoconf to produce a configure script.
 
-AC_PREREQ(2.57)dnl		Minimum Autoconf version required.
+AC_PREREQ(2.52)dnl		Minimum Autoconf version required.
 
 AC_INIT(sql/mysqld.cc)
 AC_CANONICAL_SYSTEM