Ok, it seems that I have to compile it separately for every Ubuntu release. I'll try to release it for Oneiric Ocelot tomorrow.

(You can try editing /etc/apt/sources.list and changing every occurrence of oneiric to lucid, and then run sudo apt-get update and sudo gdebi mapsi_4.1.3-1-ubuntu1_i386.deb, and then change lucid's back to oneiric and run sudo apt-get update. I'm not sure whether that would work either and it might mix something so you probably don't even want to try it.)