apeforest commented on issue #17239: Cmake with NCCL flag does not work. URL: https://github.com/apache/incubator-mxnet/issues/17239#issuecomment-573836423 In DLAMI, nccl is installed by default in the cuda directory: /usr/local/cuda/include/nccl.h However, if user installed nccl manually by themselves, sudo apt install libnccl2 libnccl-dev, you may use the `sudo dpkg-query -L libnccl-dev` to find where it is. https://askubuntu.com/questions/1134732/where-is-nccl-h I would suggest @ChaiBapchya to first search `/usr/local/cuda/include/`. If not found, try `sudo dpkg-query -L libnccl-dev` instead. Would that work?
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