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In file included from /Users/<user>/Library/Arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/avr/include/avr/io.h:99:0,
	 from /Users/<user>/Library/Arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/avr/include/avr/pgmspace.h:90,
	 from /Applications/Teensyduino.app/Contents/Java/hardware/arduino/avr/cores/arduino/Arduino.h:28,
	 from sketch/sketch_apr02b.ino.cpp:1:
/Users/<user>/Documents/Arduino/libraries/a21-master/a21/pins.hpp:111:45: error: 'reinterpret_cast<volatile uint8_t* {aka volatile unsigned char*}>(56)' is not a constant expression
static constexpr volatile uint8_t *port = &PORTB;
								 ^
/Users/<user>/Documents/Arduino/libraries/a21-master/a21/pins.hpp:113:44: error: 'reinterpret_cast<volatile uint8_t* {aka volatile unsigned char*}>(55)' is not a constant expression
static constexpr volatile uint8_t *ddr = &DDRB;
								^
/Users/<user>/Documents/Arduino/libraries/a21-master/a21/pins.hpp:115:43: error: 'reinterpret_cast<volatile uint8_t* {aka volatile unsigned char*}>(54)' is not a constant expression
static constexpr volatile uint8_t *in = &PINB;