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The official windows installer (built using NSIS) for OCaml
NSIS OCaml Makefile Emacs Lisp
tree: 04b6b888b9

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The OCaml Installer for Windows

These are the source files if you want to rebuild the installer. If you just want to download the installer, see the "website" link near the top of the page.


  • MinGW/MSYS (not Cygwin)
  • FlexDLL
  • NSIS
  • the NSISunz plugin for NSIS, that lives somewhere on the NSIS wiki


As of 2011-09-14, the OCaml sources require patching in order to build properly. This is mostly Makefile tweaking and should be integrated soon on trunk.

The instructions above sometimes use the c:\...-style paths, sometimes the /c/...-style paths. This is significant, and you cannot blindly replace one for another.

  1. Install FlexDLL from Alain's website, and
    • export PATH=/path/to/flexdll:$PATH
    • export FLEXLINKFLAGS="-L/mingw/lib -L/mingw/lib/gcc/mingw32/N.N.N" where N.N.N is the version of GCC that ships with your MinGW/MSYS setup.
  2. Grab a copy of ActiveTCL and install it, leave the default path (c:\tcl).
  3. Grab a copy of the OCaml sources, and keep the default install path (c:\ocamlmgw), this will make your life easier.
  4. Follow the instructions in README.Win32, section "MinGW/Cygwin" (but of course you're not using Cygwin, nevermind). Try to compile OCaml. Swear. Try again. Grab a tea. Succeed. Be happy.
  5. Go into the emacs/ directory.
    • Make sure there's an emacs.exe in your path (install Emacs if you have to).
    • Configure the Makefile so that the output directory is /c/ocamlmgw/emacsfiles.
    • Run make in that directory.
  6. Install NSIS, grab nsisunz.dll somewhere on the interwebs and put it NSIS's Plugins directory.
  7. Make sure /c/ocamlmgw/bin is in your path.
  8. In the ocaml-installer directory (i.e. this repo), run make. This should create a variety of files:
    • version.nsh, a NSIS header file that is generated to contain the freshly compiled OCaml's version number,
    • uninstall_lines.nsi, an OCaml-generated list of files to remove from the install directory.
  9. Make should also launch NSIS with the main script file, and hopefully it should all generate an installer. The installer is quite big (thank you camlp4).

Bugs, issues

All patches should be submitted using GitHub pull requests. All issues should be filed using the GitHug issue tracker.

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