I think the error message is from flexlink. So try
ocamlopt -cclib -link -cclib "/MT /link /SUBSYSTEM:WINDOWS" -o birthday.exe birthday.ml
Christoph Bauer

From: caml-list-bounces@yquem.inria.fr [mailto:caml-list-bounces@yquem.inria.fr] On Behalf Of Andre Tampubolon
Sent: Thursday, July 02, 2009 3:57 PM
To: caml-list@yquem.inria.fr
Subject: [Caml-list] How to use -cclib correctly?

I'm compiling a simple program (Ocaml 3.11.0, MSVC version):
ocamlopt -cclib "/MT /link /SUBSYSTEM:WINDOWS" -o birthday.exe birthday.ml

The output is:
** Fatal error: Cannot find file "/MT"
File "caml_startup", line 1, characters 0-1:
Error: Error during linking

How to use the -cclib option correctly?