How To Import External Library To OpenCV

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I would like to extract features of images using opencv 3.0 with Visual Studio 2013.

My code:

#include <stdio.h>
#include <iostream>
#include "opencv2\core.hpp"
#include "opencv2\features2d.hpp"
#include <opencv2\xfeatures2d.hpp>
#include <opencv2\highgui.hpp>

using namespace cv;
using namespace cv::xfeatures2d;

void readme();

/** @function main */
int main(int argc, char** argv)
{
    if (argc != 3)
    {
        readme(); return -1;
    }

    Mat img_1 = imread(argv[1], IMREAD_GRAYSCALE);
    Mat img_2 = imread(argv[2], IMREAD_GRAYSCALE);

    if (!img_1.data || !img_2.data)
    {
        std::cout << " --(!) Error reading images " << std::endl; return -1;
    }

    //-- Step 1: Detect the keypoints using SURF Detector
    int minHessian = 400;

    Ptr<SURF> detector = SURF::create(minHessian);

    std::vector<KeyPoint> keypoints_1, keypoints_2;

    detector->detect(img_1, keypoints_1);
    detector->detect(img_2, keypoints_2);

    //-- Draw keypoints
    Mat img_keypoints_1; Mat img_keypoints_2;

    drawKeypoints(img_1, keypoints_1, img_keypoints_1, Scalar::all(-1), DrawMatchesFlags::DEFAULT);
    drawKeypoints(img_2, keypoints_2, img_keypoints_2, Scalar::all(-1), DrawMatchesFlags::DEFAULT);

    //-- Show detected (drawn) keypoints
    imshow("Keypoints 1", img_keypoints_1);
    imshow("Keypoints 2", img_keypoints_2);

    waitKey(0);

    return 0;
}

/** @function readme */
void readme()
{
    std::cout << " Usage: ./SURF_detector <img1> <img2>" << std::endl;
}

Error:

Cannot open include file: 'opencv2\xfeatures2d.hpp': No such file or directory

In C:\OpenCV3.0.0\opencv\build\include\opencv2

directory, there is no xfeatures2d.hpp file. Thus, I should import this library externally. How to fix it?