UMPL_NINE_AXIS error while compiling

Hello everyone,

I bought a MPU6050EVB for AVR from Invensene, it works fine for 6 axis. Then I tried to compile with 9 axis and some error occured:

- Missing include file: akm/inv_external_slave_akm8975.h
- Missing ref: ak8975_get_slave_descr, inv_external_slave_akm8975_open, ...

They are related to AK8975.

Can someone pls email/advice me the missing include files.

Thanks in advance
Br
Clint