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opam 2.4 release

Feedback on this post is welcomed on Discuss! We are extremely happy to announce the release of opam 2.4.0 and encourage all users to upgrade. Please read on for installation and upgrade instructions. Major changes On opam init the compiler chosen for the default switch will no longer be ocaml-syste...

23 Jul 2025

OCamlPro

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Debugging OBuilder on macOS

The log from an OBuilder job starts with the steps needed to reproduce the job locally. This boilerplate output assumes that all OBuilder jobs start from a Docker base image, but on some operating systems, such as FreeBSD and macOS, OBuilder uses ZFS base images. On OpenBSD and Windows, it uses QEMU images.

08 May 2025

Marc Elvers

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OCaml 5.4 and opam 2.4 on their way

opam 2.4 was branched last week… very pleasing to see Ryan’s work on Nix depext support get merged (we spent quite a bit of time on that together last summer).

22 Apr 2025

David Allsopp's Blog

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