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Tarides 227 Anil Madhavapeddy's Blog 220 Watch OCaml 204 Caml Weekly News 188 OCamlPro 170 Marc Elvers 147 Jane Street Tech Blog 124 MirageOS 79 Coq 78 Frama-C 76 Robur Cooperative 70 Caml INRIA 53 Jon Ludlam's Blog at recoil.org 53 Daniel Bünzli 42 David Allsopp's Blog 31

Keyword

opam 281 compiler 200 mirageos 195 dune 185 functional programming 162 ppx 132 unikernel 132 async 125 multicore 123 functor 115 eio 114 parser 114 odoc 112 domain 104 effect 103 merlin 103 lwt 102 monad 99 js_of_ocaml 89 concurrency 88 layers 0

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2026 312 2025 425 2024 306 2023 242 2022 149 2021 196 2020 141 2019 117 2018 110 2017 99 2016 99 2015 105 2014 137 2013 98 2012 60 2011 52 2010 72 2009 35 2008 19 2007 9 2006 3 2005 4 2004 4 2003 2 2002 2

Author

Anil Madhavapeddy 234 Tarides 226 Unknown 213 Caml Weekly News 181 Mark Elvers 147 Jane Street Tech Blog 112 Coq 78 Frama-C 74 Jane Street 70 Robur Cooperative 70 Jon Ludlam 54 Caml INRIA 53 Daniel Bünzli 42 Bozhidar Batsov 28 Mathématiques et informatique - Collège de France 28

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Day10: local development builds

My typical OCaml development workflow starts with git clone ..., then opam switch create . 5.4.1 --deps-only followed by dune build. This creates a local _opam directory containing the compiler and all dependencies. It works well, but the _opam directories add up, and the build takes time.

build cache compiler day10 dune layers local opam opam-repository opam_repository

17 Apr 2026

Marc Elvers

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OCI image export from day10

mtelvers/day10 can now export build results as multi-layer OCI images, where each opam package becomes its own layer.

day10 docker image layers ocaml-base-compiler oci oci-output ocluster ocurrent skopeo

09 Apr 2026

Marc Elvers

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