diff -r a5f1e4f46d14 -r 7cdcc9dd95cb src/HOL/IsaMakefile
--- a/src/HOL/IsaMakefile	Thu Mar 12 18:01:25 2009 +0100
+++ b/src/HOL/IsaMakefile	Thu Mar 12 18:01:26 2009 +0100
@@ -175,6 +175,7 @@
   Tools/inductive_realizer.ML \
   Tools/inductive_set_package.ML \
   Tools/lin_arith.ML \
+  Tools/nat_arith.ML \
   Tools/old_primrec_package.ML \
   Tools/primrec_package.ML \
   Tools/prop_logic.ML \