CMake Error at 3rdparty/ippicv/downloader.cmake:77 (message): ICV: Failed to download ICV package:

编译OPENCV3.1.0报错

-- Looking for ffmpeg/avformat.h - not found
-- Checking for module 'libgphoto2'
--   No package 'libgphoto2' found
-- ICV: Downloading ippicv_linux_20151201.tgz...
CMake Error at 3rdparty/ippicv/downloader.cmake:73 (file):
  file DOWNLOAD HASH mismatch

    for file: [/home/songdapeng/slambook2/3rdparty/opencv-3.1.0/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e/ippicv_linux_20151201.tgz]
      expected hash: [808b791a6eac9ed78d32a7666804320e]
        actual hash: [d41d8cd98f00b204e9800998ecf8427e]
             status: [7;"Couldn't connect to server"]

Call Stack (most recent call first):
  3rdparty/ippicv/downloader.cmake:110 (_icv_downloader)
  cmake/OpenCVFindIPP.cmake:237 (include)
  cmake/OpenCVFindLibsPerf.cmake:12 (include)
  CMakeLists.txt:537 (include)

CMake Error at 3rdparty/ippicv/downloader.cmake:77 (message):
  ICV: Failed to download ICV package: ippicv_linux_20151201.tgz.
  Status=7;"Couldn't connect to server"
Call Stack (most recent call first):
  3rdparty/ippicv/downloader.cmake:110 (_icv_downloader)
  cmake/OpenCVFindIPP.cmake:237 (include)
  cmake/OpenCVFindLibsPerf.cmake:12 (include)
  CMakeLists.txt:537 (include)

-- Configuring incomplete, errors occurred!
See also "/home/songdapeng/slambook2/3rdparty/opencv-3.1.0/build/CMakeFiles/CMakeOutput.log".
See also "/home/songdapeng/slambook2/3rdparty/opencv-3.1.0/build/CMakeFiles/CMakeError.log".

解决办法

安装OpenCv 3.1的过程中要下载ippicv_linux_20151201，由于网络的原因，这个文件经常会下载失败。

解决的办法是手动下载：ippicv_linux_20151201.tgz

下载完后替换opencv-3.1.0/3rdparty/ippicv/downloads/linux-*目录下的同名文件，重新cmake。

参考

ICV: Downloading ippicv_linux_20151201.tgz 超时 - 消灭猕猴桃 - 博客园

在编译安装opencv时会存在需要下载ippicv_linux_20151201.tgz却半天下载不下来甚至经常下载失败的问题，解决方案是自行下载替换，而文件下载链接多在境外，自行下载也很缓慢，因此博主在此分享百度网盘永久有效链接，需者自取。
链接:https://pan.baidu.com/s/16Sy0IZAq3gI4NPIefBVxLw
提取码:nfvo

参考

https://blog.csdn.net/qq_40283970/article/details/104223300 

参考

每次编遇到 ippicv_linux_20151201.tgz  这个包无法下载，

1.手动下载 ippicv_linux_20151201.tgz （注意一定要下压缩包的形式，不能是解压的形式，切记。要不然编译的时候还会报错）

2.将下载好的压缩包放在： opencv-3.1.0/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e  这个路径底下

3. cd  opencv-3.1.0

    mkdir build

    cd  build

    cmake ..

    make  

    make install 

引用

https://blog.csdn.net/ll480/article/details/90213283