lib32gmp10 2:5.1.1+dfsg-3 (amd64 binary) in ubuntu saucy

 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. This
 package includes a 32 bit version of the shared library.
 .
 It has a rich set of functions, and the functions have a regular
 interface.