5910 libnisdb won't build with modern GCC

*** 18,33 ****
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2001 by Sun Microsystems, Inc.
   * All rights reserved.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <string.h>
  #include <sys/syslog.h>
  #include <sys/types.h>
  #include <rpc/types.h>
  #include <rpc/xdr.h>
--- 18,32 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2015 Gary Mills
   * Copyright (c) 2001 by Sun Microsystems, Inc.
   * All rights reserved.
   */
  
  #include <string.h>
  #include <sys/syslog.h>
  #include <sys/types.h>
  #include <rpc/types.h>
  #include <rpc/xdr.h>
*** 36,46 ****
  #include "db_mindex_c.h"
  
  #include "ldap_xdr.h"
  #include "ldap_util.h"
  
! extern bool_t xdr_nis_object();
  
  /*
   * In order not to change the on-disk NIS+ DB format, we need make sure
   * that XDR does nothing for the new structures added to various C++
   * classes.
--- 35,45 ----
  #include "db_mindex_c.h"
  
  #include "ldap_xdr.h"
  #include "ldap_util.h"
  
! #include "nis_clnt.h"
  
  /*
   * In order not to change the on-disk NIS+ DB format, we need make sure
   * that XDR does nothing for the new structures added to various C++
   * classes.