https://bugzilla.redhat.com/show_bug.cgi?id=1839256
--- Comment #3 from Robert-André Mauchin <zebob.m(a)gmail.com> ---
Maybe this is due to this part:
CMake Warning at /usr/share/cmake/Modules/FindProtobuf.cmake:500 (message):
Protobuf compiler version 3.12.3 doesn't match library version 3.11.4
Call Stack (most recent call first):
cmake/OpenCVFindProtobuf.cmake:26 (find_package)
CMakeLists.txt:676 (include)
-- Performing Test HAVE_C_WNO_UNUSED_VARIABLE
-- Performing Test HAVE_C_WNO_UNUSED_VARIABLE - Success
-- Performing Test HAVE_C_WNO_SHADOW
-- Performing Test HAVE_C_WNO_SHADOW - Success
-- ADE: Download: v0.1.1f.zip
-- Try 1 failed
--
=======================================================================
Couldn't download files from the Internet.
Please check the Internet access on this host.
=======================================================================
CMake Warning at cmake/OpenCVDownload.cmake:202 (message):
ADE: Download failed: 6;"Couldn't resolve host name"
For details please refer to the download log file:
/builddir/build/BUILD/opencv-4.2.0/build_win32/CMakeDownloadLog.txt
Call Stack (most recent call first):
modules/gapi/cmake/DownloadADE.cmake:10 (ocv_download)
modules/gapi/cmake/init.cmake:19 (include)
cmake/OpenCVModule.cmake:312 (include)
cmake/OpenCVModule.cmake:375 (_add_modules_1)
modules/CMakeLists.txt:7 (ocv_glob_modules)
-- Looking for dshow.h
-- Looking for dshow.h - found
-- Performing Test HAVE_CXX_WNO_UNDEF
-- Performing Test HAVE_CXX_WNO_UNDEF - Success
-- Caffe: NO
CMake Warning at /usr/share/cmake/Modules/FindProtobuf.cmake:500 (message):
Protobuf compiler version 3.12.3 doesn't match library version 3.11.4
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