lib{test}: cxx{utility} cxx{test} extra/cxx{test}
cxx{test} hxx{test}: cli{test}

extra/:
{
  cxx{test} hxx{test}: cli{test}
  cli.options += --cli-namespace test::extra::cli
}

cxx.poptions += -I$out_root -I$src_root
lib{test}: cxx.export.poptions = -I$out_root -I$src_root

cli.options += --cli-namespace test::cli