warning信息
```bash
CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
IPPICV: Download failed: 7;"Couldn't connect to server"
For details please refer to the download log file:
/usr/local/opencv-3.4.8/build/CMakeDownloadLog.txt
Call Stack (most recent call first):
3rdparty/ippicv/
2021-03-11 22:43:17
30.98MB
opencv
1