Cmake无法编译OPencv，报错

ippicv无法下载

CMake Error at 3rdparty/ippicv/downloader.cmake:77 (message):ICV: Failed to download ICV package: ippicv_windows_20151201.zip.Status=28;"Timeout was reached"Call Stack (most recent call first):3rdparty/ippicv/downloader.cmake:110 (_icv_downloader)cmake/OpenCVFindIPP.cmake:243 (include)cmake/OpenCVFindLibsPerf.cmake:37 (include)CMakeLists.txt:558 (include)

在sources/3rdparty/ippicv/downloader.cmake中有下载地址和md5

下载地址如下 https://raw.githubusercontent.com/Itseez/opencv_3rdparty/81a676001ca8075ada498583e4166079e5744668/ippicv/ippicv_windows_20151201.zip https://raw.githubusercontent.com/Itseez/opencv_3rdparty/81a676001ca8075ada498583e4166079e5744668/ippicv/ippicv_macosx_20151201.tgz https://raw.githubusercontent.com/Itseez/opencv_3rdparty/81a676001ca8075ada498583e4166079e5744668/ippicv/ippicv_linux_20151201.tgz