The normal Debian installation instructions are good, remember to use
wheezy as DISTRIBUTION in sources.list:
http://he.fi/aprsc/INSTALLING.html
1) If you've installed aprsc by hand before, remember to remove it first.
Make a backup copy of aprsc.conf, and "sudo dpkg --purge aprsc". If
/opt/aprsc doesn't disappear completely, reboot and "sudo rm -rf
/opt/aprsc".
2) Raspbian does not load IPv6 by default, and the default aprsc configs
include dual-stack IPv4+IPv6 configuration (Listens on "::" - all IP
addresses). You must load the IPv6 module to run aprsc with this default
config:
sudo bash
modprobe ipv6
echo ipv6 >> /etc/modules
The last command will make the ipv6 module load automatically after a
reboot.
Yes, you need to do that even if you don't really have IPv6 on your
network.