CFLAGS=-O COMMONOBJS=closefile.o  
		openfile.o squeeze.o  
		unsqueeze.o
all: 	pack unpack
pack unpack: 	$$@.o $(COMMONOBJS)  
		checksum.o
	$(CC) -o $@ $@.o $(COMMONOBJS)  
		checksum.o -lm
$(COMMONOBJS): 	filehdr.h
checksum.o: 	checksum.h
pack.o unpack.o: 	filehdr.h checksum.h