没有规则可以创建“opencv.exe”所需的目标“C:/opencv/build/lib/libopencv_world300d.dll.a”。停止

所以我试图构建一个简单的 opencv 代码，但我不断收到此错误，而且我似乎在互联网上找不到任何解决方案：

操作系统：Windows 8.1

编译器 GNU GCC 601

IDE：CLion

CMake 3.0 和 mingw64

这是我从 opencv 教程中获得的代码page http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.html

#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;

int main(int argc, char** argv )
{
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }

    Mat image;
    image = imread( argv[1], 1 );

    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);

    waitKey(0);

    return 0;
}

和 CMake 文件：

cmake_minimum_required(VERSION 3.0)
project(opencv)
set("OpenCV_DIR" "C:/opencv/build")
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )

add_executable(opencv exemple.cpp)
target_link_libraries( opencv ${OpenCV_LIBS} )

我得到这个错误吗？我检查了文件夹 C:/opencv/build/lib/ 它是空的

"C:\Program Files\JetBrains\CLion 2017.1.2\bin\cmake\bin\cmake.exe" --build 
"C:\Users\Jorge Rodriguez\Downloads\opencv-tutorial-clion-master\opencv-
tutorial-clion-master\cmake-build-debug" --target all -- -j 4
Scanning dependencies of target opencv
mingw32-make.exe[2]: *** No rule to make target                         
'C:/opencv/build/lib/libopencv_world300d.dll.a', needed by 'opencv.exe'.  Stop.
mingw32-make.exe[2]: *** Waiting for unfinished jobs....
[ 50%] Building CXX object CMakeFiles/opencv.dir/exemple.cpp.obj
CMakeFiles\Makefile2:66: recipe for target 'CMakeFiles/opencv.dir/all' failed
mingw32-make.exe[1]: *** [CMakeFiles/opencv.dir/all] Error 2
mingw32-make.exe: *** [all] Error 2
Makefile:82: recipe for target 'all' failed

P.S：我是编程新手，所以我希望得到一些具体的说明。提前致谢！