c - What is this error undefined reference to 'xdr_numbers' in RPC -

power.x

struct numbers {   int number;   int power; };  program power_prog {     version power_vers {             int power(numbers) = 1;     } = 1; } = 0x31415926; 

client.c

#include <stdlib.h> #include <stdio.h> #include <rpc/rpc.h> #include "power.h"  main(argc, argv) int argc; char **argv; { client *cl; /* rpc handle */ char *server;  int *result;      numbers num;   if (argc != 2) {     fprintf(stderr, "usage:  %s hostname\n", argv[0]);     exit(1); } server = argv[1];   /* name of server */  result = (int *)malloc(sizeof(int));  /* create client handle */ if ((cl=clnt_create(server, fact_prog, fact_vers, "udp")) == null)  {     /* failed! */     clnt_pcreateerror(server);     exit(1); }    num.number=5; num.power=3;  /* call procedure bin_date */ if ((result=fact_1(&num, power, cl))==null) {     /* failed ! */     clnt_perror(cl, server);     exit(1); } printf("factorial returned server : %d\n", *result);  clnt_destroy(cl);   /* rid of handle */ exit(0); } 

server.c

 #include <rpc/rpc.h>  #include "power.h"   int temp;  int *power_1_svc(numbers *num, struct svc_req *rqstp)  {     temp = 1;     int i;      for(i=1;i<=num->power;i++)         temp = temp * (num->number);      return &temp;   } 

in above code, there 1 error occurring:

/tmp/cc604p8x.o: in function `power_prog_1': power_svc.c:(.text+0x4f): undefined reference `xdr_numbers' collect2: error: ld returned 1 exit status 

i compiled power.x file using command: rpcgen power.x generated files. when tried compiling server code, gives above error.

 gcc -o server.out -dprc_svc_fg server.c power_svc.c 

how resolve error?