diff --git a/include/depends.mk b/include/depends.mk
new file mode 100644
index 000000000..b74e53550
--- /dev/null
+++ b/include/depends.mk
@@ -0,0 +1,28 @@
+# 
+# Copyright (C) 2007 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+# define a dependency on a subtree
+# parameters:
+#	1: directory
+#	2: directory dependency
+#	3: tempfile for file listings
+#	4: find options
+
+FINDPARAMS := -type f -not -name ".*" -and -not -path "*.svn*" 
+define rdep
+  $(foreach file,$(shell find $(1) $(FINDPARAMS) -and -not -path "*:*" $(4)),
+    $(2): $(file)
+    $(file): ;
+  )
+
+  ifneq ($(shell find $(1) $(FINDPARAMS) $(4) 2>/dev/null | md5s),$(shell cat $(3) 2>/dev/null))
+    $(2): $(3)
+  endif
+  
+  $(3): FORCE
+	@find $(1) $(FINDPARAMS) $(4) 2>/dev/null | md5s > $$@
+
+endef
diff --git a/include/host-build.mk b/include/host-build.mk
index ea7cd3aca..56d539680 100644
--- a/include/host-build.mk
+++ b/include/host-build.mk
@@ -7,6 +7,11 @@
 
 include $(INCLUDE_DIR)/host.mk
 include $(INCLUDE_DIR)/unpack.mk
+include $(INCLUDE_DIR)/depends.mk
+
+STAMP_PREPARED=$(PKG_BUILD_DIR)/.prepared
+STAMP_CONFIGURED=$(PKG_BUILD_DIR)/.configured
+STAMP_BUILT=$(PKG_BUILD_DIR)/.built
 
 ifneq ($(strip $(PKG_UNPACK)),)
   define Build/Prepare/Default
@@ -69,34 +74,38 @@ ifneq ($(strip $(PKG_SOURCE)),)
 	mkdir -p $(DL_DIR)
 	$(SCRIPT_DIR)/download.pl "$(DL_DIR)" "$(PKG_SOURCE)" "$(PKG_MD5SUM)" $(PKG_SOURCE_URL)
 
-  $(PKG_BUILD_DIR)/.prepared: $(DL_DIR)/$(PKG_SOURCE)
+  $(STAMP_PREPARED): $(DL_DIR)/$(PKG_SOURCE)
+endif
+
+ifneq ($(CONFIG_AUTOREBUILD),)
+  define HostBuild/Autoclean
+    $(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
+    $(call rdep,${CURDIR},$(STAMP_PREPARED),$(TMP_DIR)/.packagedir_$(shell echo "${CURDIR}" | md5s))
+    $(call rdep,$(PKG_BUILD_DIR),$(STAMP_BUILT),$(PKG_BUILD_DIR)/.dep_files, -and -not -path "/.*" -and -not -path "*/ipkg*")
+  endef
 endif
 
 define HostBuild
   ifeq ($(DUMP),)
-    ifeq ($(CONFIG_AUTOREBUILD),y)
-      ifneq ($$(shell $(SCRIPT_DIR)/timestamp.pl -p $(PKG_BUILD_DIR) . $(PKG_FILE_DEPEND)),$(PKG_BUILD_DIR))
-        $$(info Forcing package rebuild)
-        $(PKG_BUILD_DIR)/.prepared: package-clean
-      endif
-    endif
+    $(call HostBuild/Autoclean)
   endif
   
-  $(PKG_BUILD_DIR)/.prepared:
+  $(STAMP_PREPARED):
 	@-rm -rf $(PKG_BUILD_DIR)
 	@mkdir -p $(PKG_BUILD_DIR)
 	$(call Build/Prepare)
 	touch $$@
 
-  $(PKG_BUILD_DIR)/.configured: $(PKG_BUILD_DIR)/.prepared
+  $(STAMP_CONFIGURED): $(STAMP_PREPARED)
 	$(call Build/Configure)
 	touch $$@
 
-  $(PKG_BUILD_DIR)/.built: $(PKG_BUILD_DIR)/.configured
+  $(STAMP_BUILT): $(STAMP_CONFIGURED)
 	$(call Build/Compile)
+	@$(MAKE) $(PKG_BUILD_DIR)/.dep_files
 	touch $$@
 
-  $(STAGING_DIR)/stampfiles/.host_$(PKG_NAME)-installed: $(PKG_BUILD_DIR)/.built
+  $(STAGING_DIR)/stampfiles/.host_$(PKG_NAME)-installed: $(STAMP_BUILT)
 	$(call Build/Install)
 	mkdir -p $$(shell dirname $$@)
 	touch $$@
@@ -111,9 +120,9 @@ define HostBuild
 	rm -f $(STAGING_DIR)/stampfiles/.host_$(PKG_NAME)-installed
 
   download:
-  prepare: $(PKG_BUILD_DIR)/.prepared
-  configure: $(PKG_BUILD_DIR)/.configured
-  compile: $(PKG_BUILD_DIR)/.built 
+  prepare: $(STAMP_PREPARED)
+  configure: $(STAMP_CONFIGURED)
+  compile: $(STAMP_BUILT)
   install:
   clean: FORCE
 	$(call Build/Clean)
diff --git a/include/package-ipkg.mk b/include/package-ipkg.mk
index 86c802289..ac6912844 100644
--- a/include/package-ipkg.mk
+++ b/include/package-ipkg.mk
@@ -23,14 +23,6 @@ ifeq ($(DUMP),)
         ifeq ($(CONFIG_PACKAGE_$(1)),y)
           install: $$(INFO_$(1))
         endif
-
-        ifneq ($(MAKECMDGOALS),prereq)
-          ifneq ($$(shell $(SCRIPT_DIR)/timestamp.pl -p -x ipkg -x ipkg-install '$$(IPKG_$(1))' '$(PKG_BUILD_DIR)'),$$(IPKG_$(1)))
-            $(PKG_BUILD_DIR)/.built: package-rebuild
-            $$(info Rebuilding $(subst $(TOPDIR)/,,$$(IPKG_$(1))))
-          endif
-        endif
-
       else
         compile: $(1)-disabled
         $(1)-disabled:
diff --git a/include/package.mk b/include/package.mk
index f31fc50d5..2821493bf 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -13,6 +13,7 @@ PKG_INSTALL_DIR ?= $(PKG_BUILD_DIR)/ipkg-install
 include $(INCLUDE_DIR)/prereq.mk
 include $(INCLUDE_DIR)/host.mk
 include $(INCLUDE_DIR)/unpack.mk
+include $(INCLUDE_DIR)/depends.mk
 include $(INCLUDE_DIR)/package-defaults.mk
 include $(INCLUDE_DIR)/package-dumpinfo.mk
 include $(INCLUDE_DIR)/package-ipkg.mk
@@ -22,6 +23,14 @@ STAMP_CONFIGURED:=$(PKG_BUILD_DIR)/.configured
 STAMP_BUILT:=$(PKG_BUILD_DIR)/.built
 export CONFIG_SITE:=$(INCLUDE_DIR)/site/$(REAL_GNU_TARGET_NAME)
 
+ifneq ($(CONFIG_AUTOREBUILD),)
+  define Build/Autoclean
+    $(PKG_BUILD_DIR)/.dep_files: $(STAMP_PREPARED)
+    $(call rdep,${CURDIR},$(STAMP_PREPARED),$(TMP_DIR)/.packagedir_$(shell echo "${CURDIR}" | md5s))
+    $(call rdep,$(PKG_BUILD_DIR),$(STAMP_BUILT),$(PKG_BUILD_DIR)/.dep_files, -and -not -path "/.*" -and -not -path "*/ipkg*")
+  endef
+endif
+
 define Build/DefaultTargets
   ifneq ($(strip $(PKG_SOURCE_URL)),)
     download: $(DL_DIR)/$(PKG_SOURCE)
@@ -33,14 +42,7 @@ define Build/DefaultTargets
     $(STAMP_PREPARED): $(DL_DIR)/$(PKG_SOURCE)
   endif
 
-  ifeq ($(DUMP),)
-    ifeq ($(CONFIG_AUTOREBUILD),y)
-      ifneq ($$(shell $(SCRIPT_DIR)/timestamp.pl -p $(PKG_BUILD_DIR) . $(PKG_FILE_DEPEND)),$(PKG_BUILD_DIR))
-        $$(info Forcing package rebuild)
-        $(STAMP_PREPARED): clean
-      endif
-    endif
-  endif
+  $(call Build/Autoclean)
 
   $(STAMP_PREPARED):
 	@-rm -rf $(PKG_BUILD_DIR)
@@ -54,13 +56,10 @@ define Build/DefaultTargets
 
   $(STAMP_BUILT): $(STAMP_CONFIGURED)
 	$(Build/Compile)
+	@$(MAKE) $(PKG_BUILD_DIR)/.dep_files
 	touch $$@
 
   ifdef Build/InstallDev
-    ifneq ($$(shell $(SCRIPT_DIR)/timestamp.pl -p -x ipkg -x ipkg-install $(STAGING_DIR)/stampfiles/.$(PKG_NAME)-installed $(PKG_BUILD_DIR)),$(STAGING_DIR)/stampfiles/.$(PKG_NAME)-installed)
-      $(STAMP_BUILT): package-rebuild
-    endif
-
     compile: $(STAGING_DIR)/stampfiles/.$(PKG_NAME)-installed
     $(STAGING_DIR)/stampfiles/.$(PKG_NAME)-installed: $(STAMP_BUILT)
 	mkdir -p $(STAGING_DIR)/stampfiles
@@ -68,9 +67,6 @@ define Build/DefaultTargets
 	touch $$@
   endif
 
-  package-rebuild: FORCE
-	@-rm -f $(STAMP_BUILT)
-
   define Build/DefaultTargets
   endef
 endef