leezu commented on issue #17239: Cmake with NCCL flag does not work. URL: https://github.com/apache/incubator-mxnet/issues/17239#issuecomment-573861547 > If not found, try `sudo dpkg-query -L libnccl-dev` instead. That's would only work on Debian based platforms and only for one particular way of installing nccl on these systems. I think it's safe to require users to set `NCCL_ROOT` if they manually installed nccl to a different path. In fact, we should fall-back to building nccl ourselves if nccl is required and not found.
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