Strange. if it supports nslu2 optware, why don’t the upgrade their ipkg tree? Looks like you can make your own build tree using:
Then get the sources and “make OPTWARE_TARGET=mss mt-daapd-ipk”.
You should grind for a pretty long while and end up with a mt-daapd ipk file in the “build” directory that you can install.
How much is the mss?