/usr/powerpc-linux-gnuspe/lib/libgnarl-7.so is in gnat-7-powerpc-linux-gnuspe 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc-linux-gnuspe/lib/libgnarl-7.so.1
/usr/powerpc-linux-gnuspe/lib/libgnarl-7.so.1