+
+# in case there is no patch tool on the host we need to make patch tool a
+# dependency for tools which have patches directory
+$(foreach tool, $(tools-y), $(if $(wildcard $(curdir)/$(tool)/patches),$(eval $(curdir)/$(tool)/compile += $(curdir)/patch/install)))
+
+$(foreach tool, $(filter-out xz,$(tools-y)), $(eval $(curdir)/$(tool)/compile += $(curdir)/xz/install))
+
+# make any tool depend on tar, xz and patch to ensure that archives can be unpacked and patched properly
+tools-core := tar xz patch
+
+$(foreach tool, $(tools-y), $(eval $(curdir)/$(tool)/compile += $(patsubst %,$(curdir)/%/install,$(tools-core))))
+tools-y += $(tools-core)
+
+# make core tools depend on sed and flock
+$(foreach tool, $(tools-core), $(eval $(curdir)/$(tool)/compile += $(curdir)/sed/install))
+
+$(curdir)/sed/compile := $(curdir)/flock/install
+tools-y += flock sed
+
+$(curdir)/builddirs := $(tools-y) $(tools-dep) $(tools-)
+$(curdir)/builddirs-default := $(tools-y)
+
+ifdef CHECK_ALL
+$(curdir)/builddirs-check:=$($(curdir)/builddirs)
+$(curdir)/builddirs-download:=$($(curdir)/builddirs)
+endif
+
+ifndef DUMP_TARGET_DB
+define PrepareStaging
+ @for dir in $(1); do ( \
+ $(if $(QUIET),,set -x;) \
+ mkdir -p "$$dir"; \
+ cd "$$dir"; \
+ mkdir -p bin lib include stamp; \
+ ); done
+endef
+
+# preparatory work
+$(STAGING_DIR)/.prepared: $(TMP_DIR)/.build
+ $(call PrepareStaging,$(STAGING_DIR))
+ mkdir -p $(BUILD_DIR)/stamp
+ touch $@
+
+$(STAGING_DIR_HOST)/.prepared: $(TMP_DIR)/.build
+ $(call PrepareStaging,$(STAGING_DIR_HOST))
+ mkdir -p $(BUILD_DIR_HOST)/stamp $(STAGING_DIR_HOST)/include/sys
+ $(INSTALL_DATA) $(TOPDIR)/tools/include/*.h $(STAGING_DIR_HOST)/include/
+ $(INSTALL_DATA) $(TOPDIR)/tools/include/sys/*.h $(STAGING_DIR_HOST)/include/sys/
+ ln -sf lib $(STAGING_DIR_HOST)/lib64
+ touch $@
+
+endif
+
+$(curdir)//prepare = $(STAGING_DIR)/.prepared $(STAGING_DIR_HOST)/.prepared
+$(curdir)//compile = $(STAGING_DIR)/.prepared $(STAGING_DIR_HOST)/.prepared
+
+# prerequisites for the individual targets
+$(curdir)/ := .config prereq
+$(curdir)//install = $(1)/compile
+
+tools_enabled = $(foreach tool,$(sort $(tools-y) $(tools-)),$(if $(filter $(tool),$(tools-y)),y,n))
+$(eval $(call stampfile,$(curdir),tools,install,,_$(subst $(space),,$(tools_enabled))))
+$(eval $(call stampfile,$(curdir),tools,check,$(TMP_DIR)/.build))
+$(eval $(call subdir,$(curdir)))