Similar to https://github.com/TokTok/c-toxcore/blob/3a5da3588f693ba17768a9a4cbd67d54d53114ac/toxcore/tox_events.h#L28 NGC needs event structs for each of the newly defined callbacks.
Similar to
c-toxcore/toxcore/tox_events.h
Line 28 in 3a5da35