You will need to to hand-compile asterisk on the target machine and then install sark with the --force-depends option (it will complain that asterisk is not installed otherwise). As far as I know, app_rpt only runs with asterisk 1.4 (wheezy will install 1.8 if you use apt-get). Also, we've only tested on arm5 and arm6l so if your cpu gives a different signature your mileage may vary.
Interesting project, let us know how you get on
Kind Regards
S