首先下载Opencv，我下载的版本是opencv-3.2.0.zip
cd opencv-3.2.0/
mkdir build
cd build
cmake ..
此时会显示：– ICV: Downloading ippicv_linux_20151201.tgz… 由于这个需要翻墙，所以没法下载。
去百度里面搜索该安装包，拷贝到opencv文件下的opencv/3rdparty/ippicv/downloads/linux-8b449a536a2157bcad08a2b9f266828b/ 目录里面即可，然后重新运行cmake指令
接着运行
make
make install
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