diff -rau openl2tp-1.8.o/Makefile openl2tp-1.8/Makefile
--- openl2tp-1.8.o/Makefile	2011-06-03 18:21:09.000000000 +0200
+++ openl2tp-1.8/Makefile	2011-06-03 18:54:43.000000000 +0200
@@ -197,7 +197,7 @@
 
 .PHONY:			$(SUBDIRS:%=subdir-%)
 
-$(SUBDIRS:%=subdir-%):	FORCE
+$(SUBDIRS:%=subdir-%):	FORCE generated-files
 			$(MAKE) -C $(@:subdir-%=%) $(MFLAGS) EXTRA_CFLAGS="$(CPPFLAGS)"
 
 ifeq ($(L2TP_FEATURE_LOCAL_CONF_FILE),y)
@@ -271,7 +271,7 @@
 l2tpconfig:		$(L2TPCONFIG_SRCS.o)
 			$(CC) $(LDFLAGS) -o $@ $^ $(LDFLAGS.l2tpconfig)
 
-%.o:	%.c
+%.o:	%.c generated-files
 			$(CC) -c $(CFLAGS) $< -o $@
 
 l2tp_options.h:	FORCE