Thread: Implicit declaration of function

Hi,
i've done some search in this forum but didn't find any solution.
Basically, my program use some functions like: strcpy, strlen ...

When compiling, it throws some warnings:

server.c:114: warning: implicit declaration of function `strstr'
server.c:117: warning: implicit declaration of function `strncpy'
server.c:125: warning: implicit declaration of function `strlen'
....
.....

How do i get rid of it (not by using tag while compiling) ? Do i need to #define or #include any extra thing ?

i did include both <string.h> and <strings.h>
But still no help !

Anh

Here's the begining of the source code (all include and define):

Code:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <strings.h>

#define BUFFERLENGTH 256
#define _GNU_SOURCE

And im using

Code:

 cc -Wall -o

to compile and generate binary