All you need do is install the Math::Pari module. To do that, you will need to grab the pari source, but you don't have to build GP/PARI - see the instructions at
.
Last time I tried, Math::Pari wouldn't build with the pari-2.3.4 source, so (I think) I used the pari-2.1.7 source, which was fine. Perhaps that has changed with latest Math::Pari releases - last version I built was 2.010800.