Chris,
As I suggested yesterday, it is probably not a good idea to attempt to install mt-daapd (or any other uNSLUng package for that matter) to the internal flash storage of a slug. On a properly uNSLUng device, all packages are installed in the /opt/bin directory – which is actually a symbolic link to /share/hdd/conf/opt; “hdd” being an external, USB 2.0 drive preferably attached to port one.
Returning to my comment regarding your reinstall task six from a post yesterday, you need to have a drive attached to the slug so that mt-daapd and its dependencies can be installed to that destination.
Herman