CC = $(CROSS_COMPILE)gcc CFLAGS += -O2 -Wall -g -D_GNU_SOURCE all: lsgpio gpio-hammer gpio-event-mon lsgpio: lsgpio.o gpio-utils.o gpio-hammer: gpio-hammer.o gpio-utils.o gpio-event-mon: gpio-event-mon.o gpio-utils.o %.o: %.c gpio-utils.h .PHONY: clean clean: rm -f *.o lsgpio gpio-hammer gpio-event-mon