.PHONY: clean backup test
SHELL=/bin/bash
CC=gcc

OBJS=hello.o do_hello.o

#do_hello.o: do_hello.c hello.h
#hello.o: hello.c hello.h version.h

hello: $(OBJS)
	gcc -o hello $(OBJS)

*.o: *.h

test: hello
	@echo Testing...
	./hello

clean:
	rm -f hello $(OBJS)

backup:
	@echo Making archive...
	@mkdir -p .backups
	@mar c .backups/backup-$$(date "+%Y%m%d.%H%M").mar \
	    Makefile *.c
	@echo Mailing...
	@mail -s "backup of hello" $(USER) < $$(ls -t .backups/* | head -1)
	@echo Done!
	@echo Most recent backups:
	@ls -ltr .backups | tail -3