Implementation of eMPL library on Arduino

Hi all, i used MPU-9250 breakout board on my project, and i extract raw data using DMP library, now i see that eMPL library have more tools like calibration when no-motion, 9-axys-fusion output ecc.. so i added all the header files to my arduino project, added BUILD directive: " EMPL;USE_DMP;MPU9250;REMOVE_LOGGING;MPL_LOG_NDEBUG=0;ARDUINO_SAM_DUE ", LINKING directive: "-LC:\libmplmpu\mpl -llibmplmpu" but it doesn't build! Error reported is: "undefined reference to inv_enable_9x_sensor_fusion" but i added of course fusion_9axys.h to my project and libmplmpu is Cortex M0+ plus version wich is the same processor of my arduino board.
Someone can help me??
Thanks a lot!