REFERENCE:
    https://l4re.org/doc/l4re_build_system.html


L4 must be built out-of-tree

    make B=<builddir>   # create build (object) dir
    make O=<builddir>   # invoke make with specified object dir

to include the builddir into the makefile (or local config)

    OBJ_BASE = <builddir>

BID Makefile: if I understand correctly every level of subdir should have one
Makefile. Specify the role:

    {project, subdir, prog, lib, include, doc, test, ldl, runux}.mk

EXAMPLE BID Makefile

    PKGDIR  ?=  <>


jargons

    BID:    refers to L4RE build system (but why?)





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