Next paragraph is an excerpt from document This package is a Perl interface to famous library PARI for numerical/scientific/number-theoretic calculations. It allows use of most PARI functions as Perl functions, and (almost) seamless merging of PARI and Perl data. Documentation to this package is contained inside Pari.pm. After installing it is accessible by standard means, like perldoc Math::Pari man Math::Pari and possibly in other forms particular for your system. If you have a not very old perl (5.003 should do), then uncompress the archive into a separate directory, find the archtecture of your processor (if it is not recognized automatically, the slower portable code will be used), and do perl Makefile.PL or perl Makefile.PL machine=hppa (recognized processors are sun3 sparcv7 sparcv8micro sparcv8super alpha hppa i386), then make make test (expect many false negatives from the test Testout.t, but Pari.t should pass). Now make install should make this extension available to the perl programs. You can get a better undestanding of what fails in Testout.t by running it manually: perl t/Testout.t after install, or perl -Mblib t/Testout.t before install.