qcow support build failure with ocaml 4.12

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
macos, ocaml
Domain
build-system

Research direction

Start by reproducing the reported opam install command for qcow.0.11.0, qcow-tool, and the listed dependencies with OCaml 4.12 on the M1 setup. Inspect the OCaml version constraint reported for lwt and determine the compatibility change or documentation needed for qcow support to build successfully.

Written by the indexing model from the issue text.

Description

Trying to build cow support on a brand new MacBook with m1 chip:

ncopa@ncopa-mbp13 hyperkit % opam install uri qcow.0.11.0 conduit.2.1.0 lwt.5.3.0 qcow-tool mirage-block-unix.2.12.0 conf-libev logs fmt mirage-unix prometheus-app

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><>  🐫 
[qcow.0.11.0] no changes from git://github.com/mirage/ocaml-qcow
[qcow-tool.0.11.0] no changes from git://github.com/mirage/ocaml-qcow

The following dependencies couldn't be met:
  - lwt → ocaml < 4.12
      base of this switch (use `--unlock-base' to force)

No solution found, exiting

ocaml was installed with brew.

Dominant language
C
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