sudo cpan install Geo::PostalCode
lwp-download http://tjmather.com/Geo-PostalCode_19991101.txt.gz
gunzip Geo-PostalCode_19991101.txt.gz
cd ~/.cpan/build/Geo-PostalCode-0.06/
sudo cp ~/Geo-PostalCode_19991101.txt ./
sudo ./load.pl
sudo make test
sudo make install
perl -e 'use Geo::PostalCode'