libmpfr-dev - 4.2.0-1 main

This development package provides the header files and the symbolic
links to allow compilation and linking of programs that use the libraries
provided in the libmpfr4 package.
.
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).