+# HELPER_CACHE_FILE: Cache file update-helper script uses to avoid running
+# `debootstrap' all the time.
+# HELPER_CACHE_FILE="$(HELPER_DIR)/cache.tar"
+
+# HELPER_EXTRA_PKGS: Extra packages that will need to be supplied to de supplied
+# to debootstrap to make the resulting helper image workable
+# HELPER_EXTRA_PKGS="linux-image-amd64,e2fsprogs,ntfs-3g,ntfsprogs,xmlstarlet,python"
+