【opencv C++ linux】linux下编译含opencv的C++代码

#include <opencv2/opencv.hpp>  
#include <iostream>
#include <string>
using namespace cv;
using namespace std;
int main()
{
    Mat img = imread("img_test.jpg");
    if(img.empty())
    {
        cout<<"error";
        return -1;
    }
    cout<<"My picture: "<< img.size() <<endl;

    return 0;
}

cmake_minimum_required(VERSION 2.8)
project(opencv)
find_package(OpenCV REQUIRED)
add_executable(opencv try.cpp)
target_link_libraries(opencv ${OpenCV_LIBS})

cmake .

make

./opencv