/usr/bin/arm-linux-gnueabihf-gnat is in gnat-6-arm-linux-gnueabihf 6.4.0-17ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/arm-linux-gnueabihf-gnat-6
/usr/bin/arm-linux-gnueabihf-gnat-6