使用 Opencv4 编译但不编译链接的代码 - 找不到 Mat 和 imshow

问：

我正在尝试创建从这里获取的以下代码的可执行文件：

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/imgcodecs.hpp>

using namespace cv;
using namespace std;

// Driver code
int main(int argc, char** argv)
{
    // Read the image file as   // imread("default.jpg");
    Mat image = imread("barchart.png",  IMREAD_GRAYSCALE);

    // Error Handling
    if (image.empty()) {
        cout << "Image File Not Found" << endl;

        // wait for any key press
        cin.get();
        return -1;
    }

    // Show Image inside a window with the name provided
    imshow("Window Name", image);

    // Wait for any keystroke
    waitKey(0);
    return 0;
}

它使用命令编译所有内容并创建一个文件g++ showimage.cpp -c -I /usr/include/opencv4showimage.o

但是，以下命令链接它会产生错误：

g++ showimage.o -l:libopencv_imgcodecs.a

...
... (lot of output)
/usr/bin/ld: showimage.o: in function `main':
showimage.cpp:(.text+0x83): undefined reference to `cv::Mat::empty() const'
/usr/bin/ld: showimage.cpp:(.text+0x10e): undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'
/usr/bin/ld: showimage.cpp:(.text+0x13c): undefined reference to `cv::waitKey(int)'
/usr/bin/ld: showimage.cpp:(.text+0x150): undefined reference to `cv::Mat::~Mat()'
/usr/bin/ld: showimage.cpp:(.text+0x1c2): undefined reference to `cv::Mat::~Mat()'
collect2: error: ld returned 1 exit status

我还尝试了以下选项：

g++ showimage.o -L /usr/lib/x86_64-linux-gnu
g++ showimage.o -L libopencv
g++ showimage.o -L opencv

但没有一个是行不通的。

问题出在哪里，如何解决？