Cross compilation error

My arm toolchain is giving out this error.

hello.cpp: In function ‘int main()’: hello.cpp:6:30: error: ‘round’ is not a member of ‘std’

float frac = absval - std::round(absval);

This is my code

#include <iostream>
using namespace std;
int main()
{
    float absval = 10.3;
    float frac   = absval - std::round(absval);
}

While going through some other posts, they say round is supported from c++11. My tool chain is based on GCC 4.8.3 and i believe this version of gcc supports c++11.

Can anyone tell me why this is happening then ?