Arduino: 1.8.3 (Windows 7), Board: "Adafruit Feather M0" Build options changed, rebuilding all In file included from C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src/PulseSensorPlayground.h:426:0, from C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src\PulseSensorPlayground.cpp:16: C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src\PulseSensorPlayground.cpp: In member function 'boolean PulseSensorPlayground::sawNewSample()': C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src/utility/Interrupts.h:70:45: error: 'cli' was not declared in this scope #define DISABLE_PULSE_SENSOR_INTERRUPTS cli() ^ C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src\PulseSensorPlayground.cpp:97:5: note: in expansion of macro 'DISABLE_PULSE_SENSOR_INTERRUPTS' DISABLE_PULSE_SENSOR_INTERRUPTS; ^ C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src/utility/Interrupts.h:71:44: error: 'sei' was not declared in this scope #define ENABLE_PULSE_SENSOR_INTERRUPTS sei() ^ C:\Users\rajewskij\Documents\Arduino\libraries\PulseSensorPlayground-1.4.6\src\PulseSensorPlayground.cpp:100:5: note: in expansion of macro 'ENABLE_PULSE_SENSOR_INTERRUPTS' ENABLE_PULSE_SENSOR_INTERRUPTS; ^ exit status 1 Error compiling for board Adafruit Feather M0. This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.