1 	CFLAGS=-O
 2 	COMMONOBJS=closefile.o openfile.o  
 3 			squeeze.o unsqueeze.o
 4 	
 5 	all: 	pack unpack
 6 	pack: 	pack.o $(COMMONOBJS)  
 7 		 checksum.o
 8 		$(CC) -o $@ pack.o  
 9 			$(COMMONOBJS)  
 10 			checksum.o -lm
 11 	unpack: unpack.o $(COMMONOBJS)  
 12 			 checksum.o
 13 		$(CC) -o $@ unpack.o  
 14 			 $(COMMONOBJS)  
 15 			 checksum.o -lm
 16 	$(COMMONOBJS): 	filehdr.h
 17 	checksum.o: 	checksum.h
 18 	pack.o unpack.o: 	filehdr.h  
 19 			checksum.h