Error C

Saludos estoy intentando hacer un programa para bloquear un puerto:

#include <windows.h>

int main(int argv, char **argc)

{
SOCKET sock;
struct sockaddr_in prmts;
char apagado[6]={'O','F','F',0x9,'3',0xd};
char _hostname[50];
struct hostent *host;
short int error;
WSAData wsaData;

  WSAStartup(MAKEWORD(1,1),&wsaData);

  gethostname( _hostname, 50);
  host = gethostbyname(_hostname);

  sock = socket(AF_INET,SOCK_STREAM,0);
  prmts.sin_family = AF_INET;
  prmts.sin_port= htons(2221);
  prmts.sin_addr.s_addr = *((unsigned *)host -> h_addr_list[0]);
  memset(&(prmts.sin_zero), '\0', 8);

  while(1)
  {
     error = connect(sock, (struct sockaddr *)&prmts, sizeof(struct sockaddr));
     if(error == 0) break;
     else prmts.sin_port= htons(2222);
  }

  send(sock, apagado,6,0);
  closesocket(sock);

  return 0;
}  [/i]

Al intentar compilarlo me da los siguientes errores:

[Linker error] undefined reference to WSAStartup@8'
[Linker error] undefined reference togethostname@8'
[Linker error] undefined reference to gethostbyname@4'
[Linker error] undefined reference tosocket@12'
[Linker error] undefined reference to htons@4'
[Linker error] undefined reference toconnect@12'
[Linker error] undefined reference to htons@4'
[Linker error] undefined reference tosend@16'
[Linker error] undefined reference to `closesocket@4'

Alguien sabe a que se puede deber???
Uso el Dev-C++ 4.9.8.0
Gracias .