src/HOL/IsaMakefile

   $(SRC)/Tools/Code/code_haskell.ML \
   $(SRC)/Tools/Code/code_ml.ML \
   $(SRC)/Tools/Code/code_preproc.ML \
   $(SRC)/Tools/Code/code_printer.ML \
   $(SRC)/Tools/Code/code_scala.ML \
+  $(SRC)/Tools/Code/code_simp.ML \
   $(SRC)/Tools/Code/code_target.ML \
   $(SRC)/Tools/Code/code_thingol.ML \
   $(SRC)/Tools/Code_Generator.thy \
   $(SRC)/Tools/IsaPlanner/isand.ML \
   $(SRC)/Tools/IsaPlanner/rw_inst.ML \