lib32mpfr4 3.1.0-3ubuntu2 (amd64 binary) in ubuntu precise

 MPFR provides a library for multiple-precision floating-point computation
 with correct rounding. The computation is both efficient and has a
 well-defined semantics. It copies the good ideas from the
 ANSI/IEEE-754 standard for double-precision floating-point arithmetic
 (53-bit mantissa). This package includes a 32 bit version of the
 library.