Most packages that are still under active development now use dune, which, unlike oasis, ocamlbuild and other solutions, offers good Windows support. A special repository for Windows users is therefore becoming increasingly superfluous. In addition, there is now esy as an alternative, which also supports Windows.

To ease the transition, I will create a special branch in the near future, which will only contain the compiler packages of the old Windows repository, and can be used in addition to the normal upstream repository (opam repo add ...). However, this branch will not be maintained.

depext-cygwinports unfortunately became increasingly useless, as the main maintainer of the corresponding packages stopped his activities more than a year ago. Hopefully someone else will develop a suitable alternative; many packages rely on current third-party libraries like gmp.

OCaml version 4.11.0 is now available. Some of the highlights in this release are:

• Statmemprof: a new statistical memory profiler
• A new instrumented runtime that logs runtime statistics in a standard format
• A native backend for the RISC-V architecture
• Improved backtraces that refer to function names
• Support for recursive and yet unboxed types
• A quoted extension syntax for ppxs
• Many quality of life improvements
• Many bug fixes.

The full list of change can be found in the official announcement thread.

As usually, there are six different switches:

• 4.11.0+mingw32 / 4.11.0+mingw32c
• 4.11.0+mingw64 / 4.11.0+mingw64c
• 4.11.0+msvc32 / 4.11.0+msvc32c
• 4.11.0+msvc64 / 4.11.0+msvc64c
• 4.11.0+flambda+mingw32 / 4.11.0+flambda+mingw32c
• 4.11.0+flambda+mingw64 / 4.11.0+flambda+mingw64c

OCaml version 4.10.0 is now available.

Some of the highlights in this release are:

• A new best-fit allocator for the major heap which reduces both GC cost an memory usage.
• Some preliminary runtime work for OCaml multicore
• Immutable strings are now enforced at configuration time
• User-defined indexing operators for multidimensional arrays
• Coming soon: statmemprof, a new statistical memory profiler
• The external API will be release next version
• Various improvements to the manual
• More precise exhaustiveness check for GADTs
• Many bug fixes

Check out the official announcement thread for more details.

As usually, there are six different switches:

• 4.10.0+mingw32 / 4.10.0+mingw32c
• 4.10.0+mingw64 / 4.10.0+mingw64c
• 4.10.0+msvc32 / 4.10.0+msvc32c
• 4.10.0+msvc64 / 4.10.0+msvc64c
• 4.10.0+flambda+mingw32 / 4.10.0+flambda+mingw32c
• 4.10.0+flambda+mingw64 / 4.10.0+flambda+mingw64c

OCaml version 4.09.0 is now available. There are six different switches:

• 4.09.0+mingw32
• 4.09.0+mingw64
• 4.09.0+msvc32
• 4.09.0+msvc64
• 4.09.0+flambda+mingw32
• 4.09.0+flambda+mingw64

New OCaml releases are always added to the repository a couple of days after the official release. This page won’t be updated each time :)

The repository has been upgraded to opam 2.0 format and the installation instructions have been updated for the new opam version.

Upgrading an existing ~/.opam folder is not supported, just rename or delete the directory and let opam create a new one.

OCaml version 4.03.0 is now officially supported. There are four different switches:

• 4.03.0+mingw32
• 4.03.0+mingw64
• 4.03.0+flambda+mingw32
• 4.03.0+flambda+mingw64

You can also install the pre-compiled binaries by adding a suffix-c to the switch, e.g opam switch 4.03.0+mingw64c. Bootstrapping is much faster this way, but the binaries might not work any longer, if the maintainers of the cygwin repository update their mingw64-gcc packages.

The release of OCaml version 4.03.0 is drawing near. A first beta version was released yesterday.

You can install it with opam switch 4.03.0+beta1+mingw32 or opam switch 4.03.0+beta1+mingw64.

I’ve just activated gh-pages for this repository. The confusing information inside the README.md have been moved to dedicated pages here.

Major changes to the opam builds or the repository will be announced here. Subscribe to the RSS-Feed to stay updated on the developments.