$(sandbox-root)/include.mk Source this makefile to import library makefile logic.
$(sandbox-root)/lf/onf-maker/ $(sandbox-root)/lf/onf-maker/include.mk repo:onf-make library makefiles checked out (frozen) as a git submodule.
$(sandbox-root)/lf/local/ $(sandbox-root)/lf/local/include.mk makefile directory for per-repository targets and logic.