+$(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
+