/usr/lib/gcc-cross/alpha-linux-gnu/5.3.1 is in gcc-5-alpha-linux-gnu-base 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/alpha-linux-gnu/5
/usr/lib/gcc-cross/alpha-linux-gnu/5