env do |env|
  env["LIBSUFFIX"] = %w[.aaaa .aaa]
  env.Library("one.aaaa", "one.c", "CPPFLAGS" => ["-DONE"])
  env.Library("two.aaa", "two.c")
  env.Program("two_sources.exe", %w[one.aaaa two.aaa])
end