Why not gnat Ada in gcc?

[Richard Stallman]

    And the GNAT for Linux folks.

What an ironic name for a project.  When they say "Linux", they must
really mean the GNU/Linux system.  But GNAT itself is supposed to
exist *for* the GNU system (which includes GNU/Linux).

So if there is a need for an outside project to work on GNAT to get it
to work well in GNU/Linux, does that mean the standard GNAT is not
paying enough attention to the system it is part of?