This is Math::BigInt::Pari, a plugin module for Math::BigInt that replaces Math::BigInt's core math routines with Math::Pari routines. This package contains a replacement (drop-in) module for Math::BigInt's core, Math::BigInt::Calc.pm. It needs the new versions of Math::BigInt and Math::BigFloat as they are from Perl 5.7.x onwards. WWW: http://search.cpan.org/dist/Math-BigInt-Pari/