$(sandbox-root)/include.mk Source this makefile to import all makefile logic.
$(sandbox-root)/lf/onf-make/ $(sandbox-root)/lf/onf-make/include.mk repo:onf-make contains common library makefile logic. tag based checkout (frozen) as a git submodule.
$(sandbox-root)/lf/local/ $(sandbox-root)/lf/local/include.mk per-repository targets and logic to customize makefile behavior.