cxx = cxx/{target rule module}
config = config/{operation module}

exe{b b-prev}: cxx{b algorithm name operation spec scope variable target \
  prerequisite rule file module native context search diagnostics token \
  lexer parser process timestamp path path-io utility filesystem dump \
  options $config $cxx}

.: exe{b b-prev}

#@@ TODO
#
# cli --include-with-brackets --include-prefix build --guard-prefix BUILD --hxx-suffix "" options.cli