1CC = $(CROSS_COMPILE)gcc 2CFLAGS += -O2 -Wall -g -D_GNU_SOURCE 3 4all: lsgpio gpio-hammer 5 6lsgpio: lsgpio.o gpio-utils.o 7gpio-hammer: gpio-hammer.o gpio-utils.o 8 9%.o: %.c gpio-utils.h 10 11.PHONY: clean 12clean: 13 rm -f *.o lsgpio gpio-hammer 14