5910 libnisdb won't build with modern GCC

*** 18,27 ****
--- 18,28 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2015 Gary Mills
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #include <stdio.h>
*** 32,48 ****
  #include <errno.h>
  #include <syslog.h>
  
  #include "ldap_parse.h"
  #include "nis_parse_ldap_conf.h"
! #include "nis_parse_ldap_err.h"
  #include "ldap_util.h"
  
! extern __nis_mapping_rule_t **dup_mapping_rules(
!         __nis_mapping_rule_t **rules, int n_rules);
! extern __nis_mapping_rule_t *dup_mapping_rule(
!         __nis_mapping_rule_t *in);
  
  static int      merge_table_mapping(__nis_table_mapping_t *in,
          __nis_table_mapping_t *out);
  __nis_table_mapping_t *new_merged_mapping(const char *,
          __nis_table_mapping_t *intbl);
--- 33,50 ----
  #include <errno.h>
  #include <syslog.h>
  
  #include "ldap_parse.h"
  #include "nis_parse_ldap_conf.h"
! #include "nis_parse_ldap_util.h"
  #include "ldap_util.h"
  
! /* Forward declarations */
! int getfullmapname(char **, const char *);
! int checkfullmapname(const char *, const char *, __nis_table_mapping_t **,
!     __nis_table_mapping_t **);
! int append_domainContext(__nis_table_mapping_t **, char *, char *);
  
  static int      merge_table_mapping(__nis_table_mapping_t *in,
          __nis_table_mapping_t *out);
  __nis_table_mapping_t *new_merged_mapping(const char *,
          __nis_table_mapping_t *intbl);
*** 136,146 ****
  merge_table_mapping(
          __nis_table_mapping_t *in,
          __nis_table_mapping_t *out)
  {
          int i;
-         int len;
          int orig_num_rules;
          int append;
  
          if (in == NULL)
                  return (1);
--- 138,147 ----
*** 432,450 ****
  second_parser_pass(__nis_table_mapping_t **table_mapping)
  {
          __nis_table_mapping_t   *t, *t2;
          __nis_table_mapping_t   *t_new = NULL, *tg;
          __nis_table_mapping_t   *prev = NULL;
-         __nis_object_dn_t   *objectDN;
          char    *objs, *dom;
          char    *objName = NULL;
          char    *lasts;
          char    *tobj, *alias, *dupalias, *tmp;
          char    *myself = "second_parser_pass";
          int     i = 0, len;
-         int     remove_t = 0;
-         int     add_t = 0;
  
          prev = NULL;
          for (t = *table_mapping; t != NULL; ) {
                  /*
                   * Temporarily using this field to flag deletion.
--- 433,448 ----