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/usr/lib/linux/3.13.0-166-lowlatency/compiler is in linux-buildinfo-3.13.0-166-lowlatency 3.13.0-166.216.

This file is owned by root:root, with mode 0o644.

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1
GCC: (Ubuntu 4.8.4-2ubuntu1~14.04.4) 4.8.4