ncnn在window，vs2019，cmake-3.16.5-win64-x64编译

下载cmake，安装 cmake-3.16.5-win64-x64链接地址:https://github.com/Kitware/CMake/releases/download/v3.16.5/cmake-3.16.5-win64-x64.zip 下载cmake到D:\cmake\文件夹下，并解压到此目录下 把bin目录添加到本机环境变量，鼠标右击 此电脑->高级系统设置（左边）->环境变量->选

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