a2j_control fails because dbus is not in the python path. The exact error
message is:
Traceback (most recent call last):
File ".nix-profile/bin/a2j_control", line 11, in <module>
import dbus
ImportError: No module named dbus
The fix is to add the python dbus module to the build inputs and wrap the
python path for a2j_control.
c44c3d21ba