opencv3.4.8cmake时出现的错误

CMake Warning at /home/xxxxx/dev/tools/3rd/opencv-3.4.8/cmake/OpenCVDownload.cmake:202 (message):
  data: Download failed: 28;"Timeout was reached"

  For details please refer to the download log file:

  /home/xxxxxxxx/dev/tools/3rd/opencv-3.4.8/build_extra/CMakeDownloadLog.txt

Call Stack (most recent call first):
  /home/xxxxxxxx/dev/tools/3rd/cubone-opencv_contrib-3.4.8/opencv_contrib/modules/face/CMakeLists.txt:13 (ocv_download)


CMake Warning at /home/xxxxxxxxxxx/dev/tools/3rd/cubone-opencv_contrib-3.4.8/opencv_contrib/modules/face/CMakeLists.txt:26 (message):
  Face: Can't get model file for face alignment.