Notes:
Ringlink makes use of a collection of Perl modules called libwww-perl.
Those modules are not included in the standard Perl distribution, but
they still seem to have been added to most Perl installations.
If libwww-perl is not installed on the server where you install your copy
of Ringlink, you should preferably ask your webhosting provider to install
it. Optionally you can upload the files in this kit.