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geocoq 2.2.1 Not compatible 👼

Context

# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-threads        base
base-unix           base
conf-findutils      1           Virtual package relying on findutils
coq                 8.10.1      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.06.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.06.1      Official 4.06.1 release
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "Julien Narboux <julien@narboux.fr>"
homepage: "http://geocoq.github.io/GeoCoq/"
bug-reports: "https://github.com/GeoCoq/GeoCoq/issues"
authors: ["Gabriel Braun <gabriel.braun@unistra.fr>" 
          "Pierre Boutry <pierre.boutry@unistra.fr>"
          "Charly Gries <Charly.Gries@etu.unistra.fr>"
          "Julien Narboux <narboux@unistra.fr>"]
license: "LGPL 3"
build: [
  ["./configure.sh"]
  [make "-j%{jobs}%"]
]
install: [
  [make "install"]
]
remove: ["rm" "-R" "%{lib}%/coq/user-contrib/GeoCoq"]
depends: [
  "ocaml"
  "coq"
    {((>= "8.4pl4" & < "8.5~") | (>= "8.5" & < "8.6~") |
      (>= "8.6" & < "8.7~"))}
]
tags: [
  "keyword:geometry"
  "keyword:neutral geometry"
  "keyword:euclidean geometry"
  "keyword:foundations"
  "keyword:Tarski"
  "keyword:Hilbert"
  "keyword:Pappus"
  "keyword:Desargues"
  "keyword:parallel postulates"
  "category:Mathematics/Geometry/General"
  "date:2016-12-22"
]
synopsis: "A formalization of foundations of geometry in Coq"
flags: light-uninstall
url {
  src: "https://github.com/GeoCoq/GeoCoq/archive/v2.2.1.tar.gz"
  checksum: "md5=be429fbeba560c84c994d551bb17c894"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-geocoq.2.2.1 coq.8.10.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.10.1).
The following dependencies couldn't be met:
  - coq-geocoq -> coq < 8.5~ -> ocaml < 4.06.0
      base of this switch (use `--unlock-base' to force)
No solution found, exiting

Dry install without Coq/switch base, to test if the problem was incompatibility with the current Coq/OCaml version:

Command: opam remove -y coq; opam install -y --show-action --unlock-base coq-geocoq.2.2.1
Return code: 0

Install dependencies

Command: true
Return code: 0
Duration: 0 s

Install 🚀

Command: true
Return code: 0
Duration: 0 s

Installation size

No files were installed.

Uninstall 🧹

Command: true
Return code: 0
Missing removes: none
Wrong removes: none