file DOWNLOAD HASH mismatch（编译安装opencv 3.2.0时报错）

ubuntu 16.04
opencv 3.2.0
opencv_contrib 3.2.0

cmake时报错：

-- Check contents of boostdesc_bgm.i ...
-- Downloading boostdesc_bgm.i...
CMake Error at /root/opencv/cmake/OpenCVUtils.cmake:895 (file):file DOWNLOAD HASH mismatchfor file: [/root/opencv_contrib/modules/xfeatures2d/cmake/.download/0ea90e7a8f3f7876d450e4149c97c74f/boostdesc_bgm.i]expected hash: [0ea90e7a8f3f7876d450e4149c97c74f]actual hash: [d41d8cd98f00b204e9800998ecf8427e]status: [1;"unsupported protocol"]

解决方案：

下载下述文件：
https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_lbgm.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_bgm.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_bgm_bi.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_bgm_hd.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_binboost_064.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_binboost_128.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/34e4206aef44d50e6bbcd0ab06354b52e7466d26/boostdesc_binboost_256.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/fccf7cd6a4b12079f73bbfb21745f9babcd4eb1d/vgg_generated_48.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/fccf7cd6a4b12079f73bbfb21745f9babcd4eb1d/vgg_generated_64.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/fccf7cd6a4b12079f73bbfb21745f9babcd4eb1d/vgg_generated_80.i

https://raw.githubusercontent.com/opencv/opencv_3rdparty/fccf7cd6a4b12079f73bbfb21745f9babcd4eb1d/vgg_generated_120.i

将上述文件下载后，复制进下述文件夹：

\opencv_contrib\modules\xfeatures2d\cmake\.download

├───0ae0675534aa318d9668f2a179c2a052
│       boostdesc_lbgm.i
│
├───0ea90e7a8f3f7876d450e4149c97c74f
│       boostdesc_bgm.i
│
├───151805e03568c9f490a5e3a872777b75
│       vgg_generated_120.i
│
├───202e1b3e9fec871b04da31f7f016679f
│       boostdesc_binboost_064.i
│
├───232c966b13651bd0e46a1497b0852191
│       boostdesc_bgm_bi.i
│
├───324426a24fa56ad9c5b8e3e0b3e5303e
│       boostdesc_bgm_hd.i
│
├───7126a5d9a8884ebca5aea5d63d677225
│       vgg_generated_64.i
│
├───7cd47228edec52b6d82f46511af325c5
│       vgg_generated_80.i
│
├───98ea99d399965c03d555cef3ea502a0b
│       boostdesc_binboost_128.i
│
├───e6dcfa9f647779eb1ce446a8d759b6ea
│       boostdesc_binboost_256.i
│
└───e8d0dcd54d1bcfdc29203d011a797179vgg_generated_48.i

参考链接： https://answers.opencv.org/question/113942/cmake-failing-with-hash-mismatch/

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