--- Makefile.orig	2009-03-25 18:19:26.000000000 +0100
+++ Makefile	2009-03-25 18:20:14.000000000 +0100
@@ -140,7 +140,7 @@
 cweave: cweave.o common.o
 	$(CC) $(LINKFLAGS) -o cweave cweave.o common.o
 
-cweave.c: cweave.w $(WCHANGES)
+cweave.c: cweave.w $(WCHANGES) ctangle
 	$(CTANGLE) cweave $(WCHANGES)
 
 doc: $(SOURCES:.w=.dvi)