Gentoo GNU/Linux (http://www.gentoo.org/) now offers CVS snapshots of GNAT 5.0 if anyone is
interested in testing it. They are masked since GNAT 3.15p is still the stable release, but just
remove the gnat entry in/usr/portage/profiles/package.mask and you will be able to install it.
I only have a few tests here (that fail with gnat in gcc 3) and they worked with GNAT 5.0.
Anyway, if you are using gnat from gcc 3 you will definately want to ditch that and use the
snapshot as it contains the uncrippled gcc patch along with much newer Ada-code.
I will try to update the snapshot on a regular basis until 5.0 is released.

At the moment it is not possible to have multiple versions of GNAT installed in Gentoo. I'm
working on this since then you would be able to have both 3.15p and 5.0-snapshots. I'm currently
prioritizing porting it to other platforms though (ppc to begin with as I bought a Pegasos
yesterday).

//David Holm, Gentoo dev-team