How to solve this Semantic Errors?

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <unistd.h>

void my_handler ( timer_t timerid)
{
    printf("\nHello World\n");
}

int main()
{

 // declare some variables

 timer_t timerid;
 struct itimerspec itime;
 struct sigevent sevp;

 // initalize the sigevent variable
 // the memset is necessary to avoid segmentation faults 
 memset (&sevp, 0, sizeof (struct sigevent));
  sevp.sigev_notify=SIGEV_THREAD;
  sevp.sigev_notify_function=(void *)my_handler;


  timer_create (CLOCK_REALTIME, &sevp, &timerid);
  // initialize the timer specification
 // currently the offset and the period is 5 seconds  // you have to adjust this to your actual needs
  itime.it_value.tv_sec = 5;
  itime.it_value.tv_nsec = 0;
  itime.it_interval.tv_sec = 5;
  itime.it_interval.tv_nsec = 0;

 // create the timer
 timer_settime (timerid, 0, &itime, NULL);

 // this loop has to be adapted, so that the program ends after some time  while(1){
 // sleep(100);

}

ERRORS :

Invoking: GCC C Compiler
gcc -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/new.d" -MT"src/new.d" -o "src/new.o"  In 'CLOCK_REALTIME' undeclared (first use in this function)  
Field 'tv_nsec' could not be resolved       Semantic Error
Field 'tv_nsec' could not be resolved       Semantic Error
Field 'tv_sec' could not be resolved        Semantic Error
Field 'tv_sec' could not be resolved        Semantic Error
storage size of 'itime' isn't known     C/C++ Problem

I am using Linux operating system with Eclipse IDE.

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