/usr/share/man/man1/gcc-ranlib-6.1.gz is in gcc-6 6.3.0-18+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/x86_64-linux-gnu-gcc-ranlib-6.1.gz
/usr/share/man/man1/x86_64-linux-gnu-gcc-ranlib-6.1.gz