host-arch-arm64 1

Error log

The package failed to build. The error log from opam follows.

Opam plugin "depext" may require upgrading/reinstalling. Reinstall the plugin on the current switch? [Y/n] y
The following actions will be performed:
  - install   host-arch-x86_64      1
  - install   host-system-other     1
  - recompile ocaml-options-vanilla 1       [upstream or system changes]
  - recompile ocaml-base-compiler   5.1.1*  [upstream or system changes]
  - recompile ocaml-config          3       [upstream or system changes]
  - recompile ocaml                 5.1.1   [uses ocaml-base-compiler, ocaml-config]
  - recompile opam-depext           1.2.1-1
  - recompile base-domains          base    [uses ocaml]
  - recompile base-nnp              base    [uses base-domains]
===== 2 to install | 7 to recompile =====

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved ocaml-config.3  (cached)
-> removed   ocaml-options-vanilla.1
-> installed host-arch-x86_64.1
-> installed host-system-other.1
-> installed ocaml-options-vanilla.1
-> retrieved ocaml-base-compiler.5.1.1  (cached)
-> retrieved opam-depext.1.2.1-1  (cached)
-> removed   base-nnp.base
-> removed   base-domains.base
-> removed   opam-depext.1.2.1-1
-> removed   ocaml.5.1.1
-> removed   ocaml-config.3
-> removed   ocaml-base-compiler.5.1.1
-> installed ocaml-base-compiler.5.1.1
-> installed ocaml-config.3
-> installed ocaml.5.1.1
-> installed base-domains.base
-> installed base-nnp.base
-> installed opam-depext.1.2.1-1
Done.

<><> opam-depext.1.2.1-1 installed successfully <><><><><><><><><><><><><><><><>
=> opam-depext is unnecessary when used with opam >= 2.1. Please use opam install directly instead
# Run eval $(opam env) to update the current shell environment

<><> Carrying on to "opam depext -viy host-arch-arm64.1" ><><><><><><><><><><><>

You are using opam 2.1+, where external dependency handling has been integrated: consider calling opam directly, the 'depext' plugin interface is provided for backwards compatibility only
# Detecting depexts using vars: arch=x86_64, os=linux, os-distribution=debian, os-family=debian
[ERROR] No solution for host-arch-arm64.1:   * Incompatible packages:
            - (invariant) -> ocaml-base-compiler = 5.1.1 -> host-arch-x86_64
            - host-arch-arm64
            You can temporarily relax the switch invariant with `--update-invariant'


Command failed: opam --cli=2.1 list --readonly --external '--resolve=host-arch-arm64.1' returned 20