libgmp3c2 2:4.2.1+dfsg-4build1 (amd64 binary) in ubuntu feisty

 GNU MP is a programmer's library for arbitrary precision
 arithmetic (ie, a bignum package). It can operate on signed
 integer, rational, and floating point numeric types.
 .
 It has a rich set of functions, and the functions have a regular
 interface.
 .
 The home page is http://www.swox.com/gmp