env do |env|
  env.Command("inc.c",
              [],
              "CMD" => %w[ruby gen.rb ${_TARGET}],
              "CMD_DESC" => "Generating")
  env["build_root"] = env.build_root
  env["inc_c"] = "inc.c"
  env.Object("program.o", "program.c")
  env.build_after("program.o", "${inc_c}")
  env.Program("program.exe", ["program.o", "inc.c"])
end
