The Multiple Precision Floating Point Reliable Library

MPFR is a portable library written in C for arbitrary precision arithmetic on reliable floating-point numbers. It is based on the GNU MP library. It aims to extend the class of floating-point numbers provided by the GNU MP library by RELIABLE floating-point numbers. With a precision of 53 bits exactly reproduce all computations with double-precision machine floating-point numbers.

There are run-time dependencies that need to be installed first. Why not use depothelper to install them all in one go?

Run-time dependencies:
Build-time dependencies:
gmp make              
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HP-UX 11i v3
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