gomobile failing cpp example

cpptest_cpptest.go

package cpptest

/*
	#include "hello.h"
*/
import "C"

func Hello() {
	C.hello()
}

cpptest_hello.cpp

#include "hello.h"
#include <iostream>

using namespace std;

void hello() {
    cout<<"Hello user"<<endl;
}

cpptest_hello.h

#ifndef __HELLO_H__
#define __HELLO_H__

#ifdef __cplusplus
extern "C" {
#endif

extern void hello();

#ifdef __cplusplus
}
#endif

#endif //__HELLO_H__