It's available from the
Uwinnipeg repo. It's also available from the
Bribes repo, though I think that version was built against a generic C build of GMP. The uwinnipeg version was built against a GMP library built using many of the assembler routines, and should therefore run a little faster.
Uwinnipeg provides version 2.04, whereas Bribes offers the latest 2.06 (built against gmp-4.3.1). I'll update the uwinnipeg repo version to 2.06 today (built against the latest gmp-5.0.1).
Cheers,
Rob
UPDATE: Math-GMP-2.06 (built against gmp-5.0.1) now uploaded to 5.8 and 5.10 Uwinnipeg repos. (Until
randyk updates the webpages, they will show the version as 2.04, but you'll actually get 2.06 if you 'ppm install'.)