config/auto/gmp.pm - Test for GNU MP (GMP) Math library
Determines whether the platform supports GMP.
From http://gmplib.org/: "GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. There is no practical limit to the precision except the ones implied by the available memory in the machine GMP runs on. ..."
"The main target applications for GMP are cryptography applications and research, Internet security applications, algebra systems, computational algebra research, etc."