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