/usr/bin/mips64el-linux-gnuabi64-gnat is in gnat-7-mips64el-linux-gnuabi64 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/mips64el-linux-gnuabi64-gnat-7
/usr/bin/mips64el-linux-gnuabi64-gnat-7