if String.isPrefix "polyml" ml_system

then 

  (use "unicode_symbols.ML";

  use "html_unicode.ML";

  use "mime.ML";

  use "http_status.ML";

  use "http_util.ML";

  use "xhtml.ML";

  use "socket_util.ML";

  use "scgi_req.ML";

  use "scgi_server.ML";

  use "echo.ML";

  use "find_theorems.ML")

else ()