5910 libnisdb won't build with modern GCC

*** 17,32 ****
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  /*
   * DESCRIPTION: This is the N2L equivalent of changepasswd.c. The traditional
   *              version modifies the NIS source files and then initiates a
   *              ypmake to make the maps and push them.
   *
--- 17,31 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2015 Gary Mills
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
   * DESCRIPTION: This is the N2L equivalent of changepasswd.c. The traditional
   *              version modifies the NIS source files and then initiates a
   *              ypmake to make the maps and push them.
   *
*** 68,77 ****
--- 67,81 ----
  /* DO NOT INCLUDE SHIM_HOOKS.H */
  #include "shim.h"
  #include "yptol.h"
  #include "../ldap_util.h"
  
+ /*
+  * Undocumented external function in libnsl
+  */
+ extern int  getdomainname(char *, int);
+ 
  /* Constants */
  #define CRYPTPWSIZE CRYPT_MAXCIPHERTEXTLEN
  #define STRSIZE 100
  #define FINGERSIZE (4 * STRSIZE - 4)
  #define SHELLSIZE (STRSIZE - 2)
*** 431,441 ****
          char    *myself = "proc_map_list";
          char    *map_name;
          char    cmdbuf[BUFSIZ];
          int     map_name_len = 0;
          int     index, ans = 0;
-         int     res;
  
          /* If this is a adjunct list check LDAP had some adjunct info */
          if ((adjunct_flag) && (!pwd->adjunct)) {
                  logmsg(MSG_NOTIMECHECK, LOG_INFO,
                          "Have adjunct map list but no adjunct data in DIT");
--- 435,444 ----
*** 1052,1062 ****
  struct passwd_entry *
  get_old_info(char *name, char *domain)
  {
          char *myself = "get_old_info";
          struct passwd_entry *old_passwd;
-         char    *p;
          datum   key, data;
          suc_code res;
  
          /* Get the password entry */
          key.dptr = name;
--- 1055,1064 ----