執行一個c++的關於OpenCV的例子，報錯。
在 CMakelist.txt 檔案中，加入以下內容(如果有可以不加，缺就加)：
find_package( OpenCV 3 REQUIRED )
target_link_libraries( main ${OpenCV_LIBS} )
問題解決。
【備忘】解決錯誤：undefined reference to `cv::imread(cv::String const&, int)‘
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