_update_required := $(shell \
actual=$$(git submodule status | $(_submodule_hash)); \
stamp="$$($(_submodule_hash) $(_curr_status) 2>/dev/null)"; \
_update_required := $(shell \
actual=$$(git submodule status | $(_submodule_hash)); \
stamp="$$($(_submodule_hash) $(_curr_status) 2>/dev/null)"; \