Ada and x86_64

[Richard Kenner]

    Is that dificult even in the case that Linux port exists?  I would
    expect there to already be working 64bit Alpha Linux vesion (or not?)
    so the stuff can just be merged together, I hope.

As I said, you can do this and will probably get it to compile.  It might
or might not work exactly correctly since things usually don't go *quite*
that smoothly.  But it's certainly a good "first cut".