srand48() : Unable to compile due to scope issues on Windows in Dev-C++.

[ajiten]

Dev-C++ version 5.5.2 (Windows 7) 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

}    

[peter...@gmail.com]

srand48 is not a standard C++ function.