./darknet: error while loading shared libraries: libopencv_highgui.so.3.4: cannot open shared object_/darknet:error while loadingshared libraries:libop

解决该报错需要注意一个问题：
自己opencv版本是否为3.4
如果是locate libopencv_high_gui.so.3.4
如果opencv版本不对那么你的环境中是找不到的

如果之前可以使用那么就是你的opencv安装了更高的版本：
你需要进入你的darknet项目下：

make clean
sudo ldconfig
make ----重新编译
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注意：我出现该问题是因为我改动了我的opencv版本：4.5.3
所以我重新编译后出现：

./darknet: error while loading shared libraries: libopencv_highgui.so.4.5: cannot open shared object file: No such file or directory
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这个时候因为你的opencv版本是4.5.3
所以它去会找这个版本的库

locate libopencv_highgui.so.4.5.3
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/home/bb/.local/share/Trash/expunged/1278732157/install/lib/libopencv_highgui.so.4.5
/home/bb/.local/share/Trash/expunged/1278732157/install/lib/libopencv_highgui.so.4.5.3
/home/bb/opencv-4.5.3/build/lib/libopencv_highgui.so.4.5
/home/bb/opencv-4.5.3/build/lib/libopencv_highgui.so.4.5.3
/home/bb/opencv-4.5.3/install/lib/libopencv_highgui.so.4.5
/home/bb/opencv-4.5.3/install/lib/libopencv_highgui.so.4.5.3
/usr/local/opencv-4.5.3/lib/libopencv_highgui.so.4.5
/usr/local/opencv-4.5.3/lib/libopencv_highgui.so.4.5.3
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cd /etc/ld.so.conf.d/ ====该文件中存在opencv.conf这个文件
写入你自己opencv编译（make install）后生成的lib文件路径
例：

/usr/local/lib
/home/smile/opencv3.4.0/build/lib

sudo ldconfig
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./darknet
usage: ./darknet 成功