diff --git a/ext/etc/depend b/ext/etc/depend
new file mode 100644
index 0000000..24238ba
--- /dev/null
+++ b/ext/etc/depend
@@ -0,0 +1,8 @@
+constdefs.h : $(srcdir)/mkconstants.rb
+	@echo "generating constant definitions"
+	@$(RUBY) $(srcdir)/mkconstants.rb -o constdefs.h
+
+# AUTOGENERATED DEPENDENCIES START
+etc.o: constdefs.h
+etc.o: etc.c
+# AUTOGENERATED DEPENDENCIES END