3 OCAMLC= ocamlc.opt
  2 OCAMLOPT= ocamlopt.opt
  1
  0 heap: index.cmx heap.cmx htest.cmx
  1         ${OCAMLOPT} -o heap index.cmx heap.cmx
  2
  3 heap.cmx: heap.ml index.cmx
  4         ${OCAMLOPT} -c heap.ml
  5
  6 index.cmx: index.ml
  7         ${OCAMLOPT} -c index.ml
  8
  9 htest.cmx: htest.ml heap.cmx
 10         ${OCAMLOPT} -c htest.ml
 11
 12 clean:
 13         rm -r *.{cm{i,x},o} heap