FYI:
The problems with libnettle 1.15 was fixed earlier this week and it's now part of the snapshots. And since I've been using libgmp 4.2.1 for quite some time now I upgraded the 4.1.4 used by the snapshot builder.
These are also the versions that will be included in dists unless 4.2.2 has some compelling fixes we need. Speaking of, where has http://www.swox.com/gmp/ gone? There is no GMP page there any more, much less a changelog...