The latest version of incursion pushed to github has a new libtcod backend to replace the existing allegro one.
Anyone planning to compile this needs to know that it requires a libtcod with slight modifications, namely to #ifdef out the basic type definitions in libtcod with TCOD_SKIP_ELEMENTARYTYPES.
Anyone hoping to play this needs to know that as seen in the image, there is some colour loss. This will be tracked down at some stage, but the game should be otherwise as playable as the allegro version was + this problem.