Error with Firmata in Arduino...C++linkage

I got stuck right at the start when trying to compile and upload Firefly to my Arduino board...its giving me this error:

In file included from Firefly_Firmata.cpp:46:
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/pins_arduino.h:66: error: previous declaration of 'const uint16_t port_to_mode_PGM []' with 'C++' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/Arduino.h:127: error: conflicts with new declaration with 'C' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/pins_arduino.h:67: error: previous declaration of 'const uint16_t port_to_input_PGM []' with 'C++' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/Arduino.h:128: error: conflicts with new declaration with 'C' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/pins_arduino.h:68: error: previous declaration of 'const uint16_t port_to_output_PGM []' with 'C++' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/Arduino.h:129: error: conflicts with new declaration with 'C' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/pins_arduino.h:70: error: previous declaration of 'const uint8_t digital_pin_to_port_PGM []' with 'C++' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/Arduino.h:131: error: conflicts with new declaration with 'C' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/pins_arduino.h:72: error: previous declaration of 'const uint8_t digital_pin_to_bit_mask_PGM []' with 'C++' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/Arduino.h:133: error: conflicts with new declaration with 'C' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/pins_arduino.h:73: error: previous declaration of 'const uint8_t digital_pin_to_timer_PGM []' with 'C++' linkage
C:\Program Files\arduino-0019\hardware\arduino\cores\arduino/Arduino.h:134: error: conflicts with new declaration with 'C' linkage

I'm sure I've forgot to install something and made some basic error...

Anybody have the same problem?