Alternatives

mlgmp

• https://github.com/monniaux/mlgmp (latest)
• http://www-verimag.imag.fr/~monniaux/programmes.html#Caml (disappeared)

Also known as Caml - GMP. It's good interface to GMP and MPFR. I referred to it for making this. The files in examples/mlgmp were borrowed from it. However, most of these files do not seem to be included in the latest repository. The license of the older versions was LGPL, and the latest seems to have changed to BSDL.