-discrimination_tree.cmo : trie.cmi hExtlib.cmi discrimination_tree.cmi
-discrimination_tree.cmx : trie.cmx hExtlib.cmx discrimination_tree.cmi
+discrimination_tree.cmo : \
+ trie.cmi \
+ hExtlib.cmi \
+ discrimination_tree.cmi
+discrimination_tree.cmx : \
+ trie.cmx \
+ hExtlib.cmx \
+ discrimination_tree.cmi