This package requires one library

    the GNU Multiple Precision arithmetic library (libgmp)

Obtain from http://gmplib.org/ or from your operating system vendor.
This is a standard GNU package and comes with many Linux distributions
and may be found at the web sites of other vendors that distribute free
software.

The licence is LGPL and source is available at http://gmplib.org/#DOWNLOAD

If that doesn't work the source for GMP version 4.2.2 is available at
http://www.stat.umn.edu/geyer/rcdd/gmp-4.2.2.tar.gz.