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This was referenced Sep 27, 2017
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Introduces a consistent and cleaner way of detecting external NCCL, similar to CuDNN detection.
NCCL_ROOT_DIR="/foo/my_dir" python setup.py installfindsnccl.hin/foo/my_dir/includeandlibnccl*in/foo/my_dir/libor/foo/my_dir/lib64.Alternatively,
NCCL_LIB_DIR="/foo/my_dir/lib" python setup.py installfindsnccl.hin/foo/my_dir/includeandlibnccl*in/foo/my_dir/libAlso fixes a small
build_libs.sharg parsing bug.Fixes #2553 and #2375