.. which uses Arduino 1.0.1 with gcc-avr 4.7.2-2.
SIG_USART0_RECV is forbidden to use, even in a #ifdef test.
PROGMEM data must additionally be const. (not all instances fixed,
for instance I didn't touch he NUM_EXTRUDER>2 case)
prog_char is deprecated but available by defining __PROG_TYPES_COMPAT__
before including pgmspace.h.