which .h or lib should i include before i use "inet_ntoa"

[bigjl]

I tried to run "inet_ntoa(*((struct in_addr *)h->h_addr))", but it always says 'inet_ntoa' has not been declared.
What head file should i include to make the above code running? The following is the head files I have already included.

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
whatelse do i need?
I m running the code under linux.
g++
thnx

[Banfa]

googling "inet_ntoa" suggests

you need these 3 headers

 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

you don't have the last one included.