/usr/bin/sh4-linux-gnu-gnatmake is in gnat-5-sh4-linux-gnu 5.5.0-12ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/sh4-linux-gnu-gnatmake-5
/usr/bin/sh4-linux-gnu-gnatmake-5