Needs protobuf newer than what's in base (2.4.1)

Needs localedef to generate files/locales.h:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/localedef.html

Needs rapidjson

Needs xxd (from editors/vim) to build; seems like an excessive dependency

Needs geo/osmlr-tile-spec which has not seen a formal release yet
