/Applications/Arduino.app/Contents/Resources/Java/libraries/GSM/src/GSM3CircularBuffer.cpp: In member function 'void GSM3CircularBuffer::debugBuffer()':/Applications/Arduino.app/Contents/Resources/Java/libraries/GSM/src/GSM3CircularBuffer.cpp:269: error: 'Serial' was not declared in this scope/Applications/Arduino.app/Contents/Resources/Java/libraries/GSM/src/GSM3CircularBuffer.cpp: In static member function 'static void GSM3CircularBuffer::printCharDebug(uint8_t)':/Applications/Arduino.app/Contents/Resources/Java/libraries/GSM/src/GSM3CircularBuffer.cpp:282: error: 'Serial' was not declared in this scope/Applications/Arduino.app/Contents/Resources/Java/libraries/GSM/src/GSM3CircularBuffer.cpp:285: error: 'Serial' was not declared in this scope