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cmake tried to download those files, but failed (maybe it's too old ?)

there should be some more detailled information in the cmake output already.

if you need the cfeatures2d module, you have to solve this problem first, if you don't try to disable it: cmake -DBUILD_opencv_xfeatures2d=OFF (but again, this will also disablesome modules, that depend on it)

cmake tried to download those files, but failed (maybe it's too old ?)

there should be some more detailled information in the cmake output already.

if you need the cfeatures2d module, you have to solve this problem first, if you don't try to disable it: cmake -DBUILD_opencv_xfeatures2d=OFF (but again, this will also disablesome modules, that depend on it)

again, if it's a https problem with the builtin libcurl, try to update cmake, and rerun it.

else try harder with manual download, e.g. the vgg ones are here

cmake tried to download those files, but failed (maybe it's too old ?)

there should be some more detailled information in the cmake output already.

if you need the cfeatures2d module, you have to solve this problem first, if you don't try to disable it: cmake -DBUILD_opencv_xfeatures2d=OFF (but again, this will also disablesome disable some modules, that depend on it)

again, if it's a https problem with the builtin libcurl, try to update cmake, and rerun it.

else try harder with manual download, e.g. the vgg ones are here andthe boost ones here