I realize this is an old thread, but no answer was ever given to this problem. I just want to point out that nowadays there is a clone of the bitcoin-seeder called the generic-seeder that is much easier to setup for most altcoins and also includes a step-by-step setup guide for all parts of the process. It adds new optional features, some small fixes and most importantly, you no longer have to edit the source code to get it to work with your altcoin because all the common variables that change across altcoins have been separated into a config file for easy configuration.
Read more here:
https://bitcointalk.org/index.php?topic=5239304.0
