diff -Naurp xen-unstable.hg/buildconfigs/mk.linux-2.6-xen xen-unstable.hg-new/buildconfigs/mk.linux-2.6-xen
--- xen-unstable.hg/buildconfigs/mk.linux-2.6-xen	2005-09-20 21:52:20.000000000 -0500
+++ xen-unstable.hg-new/buildconfigs/mk.linux-2.6-xen	2005-09-22 12:16:40.297578696 -0500
@@ -40,10 +40,14 @@ $(LINUX_DIR)/include/linux/autoconf.h: r
 	  rm -f Makefile ; mv Mk.tmp Makefile )
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) oldconfig
 
+prep:	$(LINUX_DIR)/include/linux/autoconf.h
+
 config: CONFIGMODE = menuconfig
 config: $(LINUX_DIR)/include/linux/autoconf.h
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) $(CONFIGMODE)
 
+prep:	$(LINUX_DIR)/include/linux/autoconf.h
+
 clean::
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) clean
 
diff -Naurp xen-unstable.hg/buildconfigs/mk.linux-2.6-xen0 xen-unstable.hg-new/buildconfigs/mk.linux-2.6-xen0
--- xen-unstable.hg/buildconfigs/mk.linux-2.6-xen0	2005-09-20 21:52:20.000000000 -0500
+++ xen-unstable.hg-new/buildconfigs/mk.linux-2.6-xen0	2005-09-22 12:05:09.875538800 -0500
@@ -40,6 +40,8 @@ $(LINUX_DIR)/include/linux/autoconf.h: r
 	  rm -f Makefile ; mv Mk.tmp Makefile )
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) oldconfig
 
+prep:	$(LINUX_DIR)/include/linux/autoconf.h
+
 config: CONFIGMODE = menuconfig
 config: $(LINUX_DIR)/include/linux/autoconf.h
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) $(CONFIGMODE)
diff -Naurp xen-unstable.hg/buildconfigs/mk.linux-2.6-xenU xen-unstable.hg-new/buildconfigs/mk.linux-2.6-xenU
--- xen-unstable.hg/buildconfigs/mk.linux-2.6-xenU	2005-09-20 21:52:20.000000000 -0500
+++ xen-unstable.hg-new/buildconfigs/mk.linux-2.6-xenU	2005-09-22 12:05:28.233747928 -0500
@@ -40,6 +40,8 @@ $(LINUX_DIR)/include/linux/autoconf.h: r
 	  rm -f Makefile ; mv Mk.tmp Makefile )
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) oldconfig
 
+prep:	$(LINUX_DIR)/include/linux/autoconf.h
+
 config: CONFIGMODE = menuconfig
 config: $(LINUX_DIR)/include/linux/autoconf.h
 	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) $(CONFIGMODE)
diff -Naurp xen-unstable.hg/buildconfigs/Rules.mk xen-unstable.hg-new/buildconfigs/Rules.mk
--- xen-unstable.hg/buildconfigs/Rules.mk	2005-09-20 21:52:20.000000000 -0500
+++ xen-unstable.hg-new/buildconfigs/Rules.mk	2005-09-22 12:04:15.917741632 -0500
@@ -90,6 +90,9 @@ ref-%/.valid-ref: pristine-%/.valid-pris
 	touch $@ # update timestamp to avoid rebuild
 endif
 
+%-prep:	
+	$(MAKE) -f buildconfigs/mk.$* prep
+
 %-build:
 	$(MAKE) -f buildconfigs/mk.$* build
 
diff -Naurp xen-unstable.hg/Makefile xen-unstable.hg-new/Makefile
--- xen-unstable.hg/Makefile	2005-09-20 21:52:20.000000000 -0500
+++ xen-unstable.hg-new/Makefile	2005-09-22 12:12:47.782926296 -0500
@@ -63,6 +63,9 @@ tools:
 kernels:
 	for i in $(XKERNELS) ; do $(MAKE) $$i-build || exit 1; done
 
+kernels-prep:
+	for i in $(XKERNELS) ; do $(MAKE) $$i-prep || exit 1; done
+
 docs:
 	sh ./docs/check_pkgs && $(MAKE) -C docs install || true