The MF Twister Project makes use of the Atmel ASF extensions & LUFA Module.
To compile following symbols must be defined
DEBUG F_USB=48000000UL F_CPU=32000000UL USE_LUFA_CONFIG_HEADER ARCH=ARCH_XMEGA BOARD=USER_BOARD
The compiler must also link libm
The project also requires a user board configuration header file, if this is missing add the following to conf_board.h
#define CONF_BOARD_ENABLE_USARTD0