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math-classes 8.9.1 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                 8.11.1      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.09.1      The OCaml compiler (virtual package)
ocaml-base-compiler 4.09.1      Official release 4.09.1
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "b.a.w.spitters@gmail.com"
homepage: "https://github.com/coq-community/math-classes"
dev-repo: "git+https://github.com/coq-community/math-classes.git"
bug-reports: "https://github.com/coq-community/math-classes/issues"
license: "Public Domain"
synopsis: "A library of abstract interfaces for mathematical structures in Coq"
description: """
Math classes is a library of abstract interfaces for mathematical structures, such as
*  Algebraic hierarchy (groups, rings, fields, …)
*  Relations, orders, …
*  Categories, functors, universal algebra, …
*  Numbers: N, Z, Q, …
*  Operations, (shift, power, abs, …)
It is heavily based on Coq’s new type classes in order to provide: structure inference, multiple inheritance/sharing, convenient algebraic manipulation (e.g. rewriting) and idiomatic use of notations.
"""
build: [
  [ "./configure.sh" ]
  [ make "-j%{jobs}%" ]
]
install: [make "install"]
depends: [
  "ocaml"
  "coq" {(>= "8.6" & < "8.11~")}
  "coq-bignums" 
]
tags: [
  "logpath:MathClasses"
  "date:2019-07-15"
]
authors: [
  "Eelis van der Weegen"
  "Bas Spitters"
  "Robbert Krebbers"
]
url {
  src: "https://github.com/coq-community/math-classes/archive/8.9.1.tar.gz"
  checksum: "sha256=2f35df200214be783c8cc9b959482f80169bb25526b6e19b0919a7b20bf7f7ef"
}

Lint

Command: true
Return code: 0

Dry install 🏜️

Dry install with the current Coq version:

Command

opam install -y --show-action coq-math-classes.8.9.1 coq.8.11.1

Return code

5120

Output

[NOTE] Package coq is already installed (current version is 8.11.1).
The following dependencies couldn't be met:
  - coq-math-classes -> coq < 8.11~ -> ocaml < 4.06.0
      base of this switch (use `--unlock-base' to force)
Your request can't be satisfied:
  - No available version of coq satisfies the constraints
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-math-classes.8.9.1
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