#include <stdio.h>
#include <stdlib.h>
#include <errno.h>		// defines perror(), herror() 
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>		// gethostbyname()
#include <netconfig.h>

#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/select.h>		// for select() system call only
#include <sys/timeb.h>		// time(), ftime() functions



Compiling......

Put these linker options in the makefile 

-lsocket -lnsl  : required for Solaris 
-elf		: some solaris (for elf libraries)