THEGIFS = \ germany.gif \ europe.gif \ theglobe.gif THETIFS = \ germany.tif \ europe.tif \ theglobe.tif tif: $(THETIFS) gif: $(THEGIFS) theglobe.tif: giftoppm theglobe.gif | pnmtotiff > theglobe.tif germany.tif: giftoppm germany.gif | pnmtotiff > germany.tif europe.tif: giftoppm europe.gif | pnmtotiff > europe.tif theglobe.gif: tifftopnm theglobe.tif | ppmtogif > theglobe.gif germany.gif: tifftopnm germany.tif | ppmtogif > germany.gif europe.gif: tifftopnm europe.tif | ppmtogif > europe.gif clean: $(RM) *.tif