gcc-6-base 6.3.0-18+deb9u1 / usr / lib / gcc / x86_64-linux-gnu / 6.3.0

/usr/lib/gcc/x86_64-linux-gnu/6.3.0 is in gcc-6-base 6.3.0-18+deb9u1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/gcc/x86_64-linux-gnu/6