CC    /usr/share/arduino/hardware/arduino/cores/arduino/wiring.c
CC    /usr/share/arduino/hardware/arduino/cores/arduino/wiring_analog.c
CC    /usr/share/arduino/hardware/arduino/cores/arduino/wiring_digital.c
CC    /usr/share/arduino/hardware/arduino/cores/arduino/wiring_pulse.c
CC    /usr/share/arduino/hardware/arduino/cores/arduino/wiring_shift.c
CC    /usr/share/arduino/hardware/arduino/cores/arduino/WInterrupts.c
CXX   /usr/share/arduino/hardware/arduino/cores/arduino/WMath.cpp
CXX   /usr/share/arduino/hardware/arduino/cores/arduino/WString.cpp
CXX   /usr/share/arduino/hardware/arduino/cores/arduino/Print.cpp
CXX   Marlin_main.cpp
CXX   MarlinSerial.cpp
CXX   Sd2Card.cpp
CXX   SdBaseFile.cpp
CXX   SdFatUtil.cpp
CXX   SdFile.cpp
CXX   SdVolume.cpp
CXX   motion_control.cpp
CXX   planner.cpp
CXX   stepper.cpp
CXX   temperature.cpp
CXX   cardreader.cpp
CXX   ConfigurationStore.cpp
CXX   watchdog.cpp
CXX   /usr/share/arduino/libraries/SPI/SPI.cpp
CXX   Servo.cpp
CXX   /usr/share/arduino/hardware/arduino/cores/arduino/Tone.cpp
CXX   ultralcd.cpp
CXX   /usr/share/arduino/libraries/LiquidCrystal/LiquidCrystal.cpp
CXX   /usr/share/arduino/hardware/arduino/cores/arduino/main.cpp
CXX   applet/Marlin.elf
applet/Marlin_main.o: In function `run_z_probe()':
Marlin_main.cpp:(.text._ZL11run_z_probev+0x30): undefined reference to `matrix_3x3::set_to_identity()'
applet/Marlin_main.o: In function `process_commands()':
Marlin_main.cpp:(.text._Z16process_commandsv+0x172): undefined reference to `matrix_3x3::set_to_identity()'
Marlin_main.cpp:(.text._Z16process_commandsv+0x770): undefined reference to `matrix_3x3::set_to_identity()'
Marlin_main.cpp:(.text._Z16process_commandsv+0xc32): undefined reference to `qr_solve(int, int, double*, double*)'
Marlin_main.cpp:(.text._Z16process_commandsv+0xd02): undefined reference to `vector_3::vector_3(float, float, float)'
Marlin_main.cpp:(.text._Z16process_commandsv+0xd10): undefined reference to `vector_3::debug(char*)'
Marlin_main.cpp:(.text._Z16process_commandsv+0xd62): undefined reference to `matrix_3x3::create_look_at(vector_3)'
Marlin_main.cpp:(.text._Z16process_commandsv+0xecc): undefined reference to `apply_rotation_xyz(matrix_3x3, float&, float&, float&)'
applet/planner.o: In function `plan_buffer_line(float, float, float, float const&, float, unsigned char const&)':
planner.cpp:(.text._Z16plan_buffer_linefffRKffRKh+0xca): undefined reference to `apply_rotation_xyz(matrix_3x3, float&, float&, float&)'
applet/planner.o: In function `plan_get_position()':
planner.cpp:(.text._Z17plan_get_positionv+0x52): undefined reference to `vector_3::vector_3(float, float, float)'
planner.cpp:(.text._Z17plan_get_positionv+0x7e): undefined reference to `matrix_3x3::transpose(matrix_3x3)'
planner.cpp:(.text._Z17plan_get_positionv+0xb4): undefined reference to `vector_3::apply_rotation(matrix_3x3)'
applet/planner.o: In function `plan_set_position(float, float, float, float const&)':
planner.cpp:(.text._Z17plan_set_positionfffRKf+0x74): undefined reference to `apply_rotation_xyz(matrix_3x3, float&, float&, float&)'
collect2: error: ld returned 1 exit status
make: *** [applet/Marlin.elf] Error 1