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If you don't need deep neural networks with Caffe support, just uncheck BUILD_PROTOBUF (and the DNN related stuff). The error message shows that it tried to download the Protobuf sources for local build, but it didn't succeed.
If you need DNN, it's probably better to install Protobuf and Caffe separately before building OpenCV. I had similar issues while trying to build OpenCV on Windows with DNN.
