Log Message:
Now packaging confirmed on pbulk environment.

Makefile
- Add avr-libc in depeding list
  +BUILD_DEPENDS+=                avr-libc-[0-9]*:../../wip/avr-libc
  (buildlink3.mk doen't seem to work).
- Missing swig added
  +.include "../../devel/swig/buildlink3.mk"

PLIST
- examples/python directory doesn't seem to be activated.
  Drop from PLIST.