From what I know, this is an unofficial pathc, and as such, you should contact the auther of the patch for more help.
Until IPv6 is widly available, adopted for shell use, has official support wihtin eggdrop (should be in the overhaul of 1.7 (not even alpha yet)) and there are people with proper IPv6 experience, then it is doubtfl you will get any help on this board.