odeint ,,,regarding Boost libraries in g++

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Ubuntu

Hello,

I downloaded odeint-v2 in a folder called C++.
I created a new cpp file called HARMONIC.cpp.

#include <iostream>
#include <vector>

#include <boost/numeric/odeint.hpp>

using namespace boost::numeric::odeint;

std::vector<double> state_type;

double gam = 0.15;

void harmonic_oscillator( const state_type &x , state_type &dxdt , const double )
{
    dxdt[0] = x[1];
    dxdt[1] = -x[0] - gam*x[1];
}

int main(int, char**)
{
    using namespace std;
    using namespace boost::numeric::odeint;



    state_type x(2);
    x[0] = 1.0;
    x[1] = 0.0;


    size_t steps = integrate( harmonic_oscillator ,
            x , 0.0 , 10.0 , 0.1 );
}

While compiling in ubuntu
g++ HARMONIC.cpp -o har.output

The error is as following

HARMONIC.cpp:4:36: fatal error: boost/numeric/odeint.hpp: No such file or directory
compilation terminated.

But i downloaded in the same folder all the odeint-v2.

Please help me