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OpenCV编译出错：
CMake Error at D:/opencv-3.1.0/cmake/OpenCVUtils.cmake:895 (file):
file DOWNLOAD HASH mismatch
for file: [D:/opencv-3.1.0/build//cv/face//downloads/7505c44ca4eb54b4ab1e4777cb96ac05/face_landmark_model.dat]
expected hash: [7505c44ca4eb54b4ab1e4777cb96ac05]
actual hash: [d41d8cd98f00b204e9800998ecf8427e]
status: [7;"Couldn't connect to server"]
Call Stack (most recent call first):
D:/opencv_contrib-master/modules/face/CMakeLists.txt:13 (ocv_download)
CMake Error at D:/opencv-3.1.0/cmake/OpenCVUtils.cmake:899 (message):
Failed to download face_landmark_model.dat. Status=7;"Couldn't connect to
server"
Call Stack (most recent call first):
D:/opencv_contrib-master/modules/face/CMakeLists.txt:13 (ocv_download)下载好了face_landmark_model.dat ，
放入[D:/opencv-3.1.0/build//cv/face//downloads/7505c44ca4eb54b4ab1e4777cb96ac05/face_landmark_model.dat]
替换掉0KB的下载失败文件。再次Generate。
问题:
CMake Error at /home/ubuntu/opencv3.1.0/opencv-3.1.0/cmake/OpenCVUtils.cmake:895 (file):
file DOWNLOAD cannot open file for write.
Call Stack (most recent call first):
/home/ubuntu/opencv3.1.0/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20 (ocv_download)
CMake Error at /home/ubuntu/opencv3.1.0/opencv-3.1.0/cmake/OpenCVUtils.cmake:899 (message):
Failed to download . Status=
Call Stack (most recent call first):
/home/ubuntu/opencv3.1.0/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20 (ocv_download)
-- Configuring incomplete, errors occurred!
See also "/home/ubuntu/opencv3.1.0/opencv-3.1.0/build/CMakeFiles/CMakeOutput.log".
See also "/home/ubuntu/opencv3.1.0/opencv-3.1.0/build/CMakeFiles/CMakeError.log".
解决：
找到(ocv_download)前面的txt，把报错的行数：
opencv_contrib/modules/dnn_modern/CMakeLists.txt
中的FILENAME替换为PACKAGE，继续Generate。
同理出现其他类似(ocv_download)的问题，找到(ocv_download)前面的文本，继续如此替换即可！