env(echo: :command) do |env|
  env.append("CPPPATH" => glob("src/**"))
  FileUtils.mkdir_p(env.build_root)
  FileUtils.mv("src/one/one.c", env.build_root)
  FileUtils.mv("src/two/two.c", Rscons.application.build_dir)
  env.Object("^/one.o", "^/one.c")
  env.Program("^^/program.exe", ["^/one.o", "^^/two.c"])
end