Hello!
Sorry for the "late" reply... Just back from a short vacation period.
Hmm... as WildWeasel already suggested, the only useful thing I might do would be to (redundantly) provide a direct link to the GZDOOM SVN builds page, kindly hosted by DRDTeam:
http://svn.drdteam.org/gzdoom/
This is a page where you can find downloadable versions of GZDOOM that include features and fixes beyond the latest official version (that is 1.5.6, quite old by now, eh

).
As you can see from the textfile accompanying Polaris, you need an "unofficial" GZDOOM build whose release number should be equal to or above
r1250. By the time of this very post, the newest build provided is r1415, so you should be perfectly fine trying that one or any other that comes up in the meantime.
So, I hope you have fun with the mod! And don't forget to freely post your impressions and suggestions if you like!
