Unable to compile due to scope issues on Windows in Dev-C++.

[JITENDER AHUJA]

Dev-C++ version 5.5.2 gives compilation error that occurs in the last line in main():

[Error] 'srand48' was not declared in this scope

#include <sys/time.h>
#include <cmath>
    #include <cstdlib>
    #include <stdlib.h>

extern double drand48();
extern long lrand48(/*long*/);
extern int rand();
extern void srand(long seedval);

//main program
main()
{

//set random number generator
struct timeval tp;
struct timezone tzp;
gettimeofday(&tp,&tzp);
srand48(tp.tv_usec); //compilation error occurs here: [Error] 'srand48' was not declared in this scope
}