diff -Naur ocaml-3.12.1.orig/otherlibs/labltk/browser/Makefile.nt ocaml-3.12.1/otherlibs/labltk/browser/Makefile.nt
--- ocaml-3.12.1.orig/otherlibs/labltk/browser/Makefile.nt	2008-12-03 18:09:09.000000000 +0000
+++ ocaml-3.12.1/otherlibs/labltk/browser/Makefile.nt	2011-11-16 14:28:25.000000000 +0000
@@ -9,7 +9,7 @@
 ifeq ($(CCOMPTYPE),cc)
 WINDOWS_APP=-ccopt "-link -Wl,--subsystem,windows"
 else
-WINDOWS_APP=-ccopt "-link /subsystem:windows"
+WINDOWS_APP=-cclib "-subsystem windows" -cclib "-link /entry:mainCRTStartup"
 endif

 XTRAOBJ=winmain.$(O)