This result is black-listed as it is considered as too hard to reproduce / to solve. If you find a way to fix this package, please make a pull-request to github.com/coq/opam-coq-archive. The list of black-listed packages is in black_list.rb.
# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-threads        base
base-unix           base
conf-findutils      1           Virtual package relying on findutils
coq                 8.12.0      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.10.2      The OCaml compiler (virtual package)
ocaml-base-compiler 4.10.2      Official release 4.10.2
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
# opam file:
opam-version: "2.0"
maintainer: "palmskog@gmail.com"
homepage: "https://github.com/coq-community/reglang"
dev-repo: "git+https://github.com/coq-community/reglang.git"
bug-reports: "https://github.com/coq-community/reglang/issues"
doc: "https://coq-community.github.io/reglang/"
license: "CECILL-B"
synopsis: "Representations of regular languages (i.e., regexps, various types of automata, and WS1S) with equivalence proofs, in Coq and MathComp"
description: """
This library provides definitions and verified translations between
different representations of regular languages: various forms of
automata (deterministic, nondeterministic, one-way, two-way),
regular expressions, and the logic WS1S. It also contains various
decidability results and closure properties of regular languages."""
build: [make "-j%{jobs}%"]
install: [make "install"]
depends: [
  "coq" {>= "8.10" & < "8.17~"}
  "coq-mathcomp-ssreflect" {>= "1.11" & < "1.16~"}
]
tags: [
  "category:Computer Science/Formal Languages Theory and Automata"
  "keyword:regular languages"
  "keyword:regular expressions"
  "keyword:finite automata"
  "keyword:two-way automata"
  "keyword:monadic second-order logic"
  "logpath:RegLang"
  "date:2021-01-20"
]
authors: [
  "Christian Doczkal"
  "Jan-Oliver Kaiser"
  "Gert Smolka"
]
url {
  src: "https://github.com/coq-community/reglang/archive/v1.1.3.tar.gz"
  checksum: "sha512=45085423899a0957922198c24c54c496cc4d4f9f02bd9ed6db72854436982acc9994487b0381bad8046eec5be0252a6fdc2ef0f001e48a0f58c323f1e46ee143"
}
            trueDry install with the current Coq version:
opam install -y --show-action coq-reglang.1.1.3 coq.8.12.0Dry install without Coq/switch base, to test if the problem was incompatibility with the current Coq/OCaml version:
trueopam list; echo; ulimit -Sv 4000000; timeout 4h opam install -y --deps-only coq-reglang.1.1.3 coq.8.12.0# Packages matching: installed
# Name              # Installed # Synopsis
base-bigarray       base
base-threads        base
base-unix           base
conf-findutils      1           Virtual package relying on findutils
coq                 8.12.0      Formal proof management system
num                 1.4         The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml               4.10.2      The OCaml compiler (virtual package)
ocaml-base-compiler 4.10.2      Official release 4.10.2
ocaml-config        1           OCaml Switch Configuration
ocamlfind           1.9.5       A library manager for OCaml
The following actions will be performed:
  - install coq-mathcomp-ssreflect 1.14.0
<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The sources of the following couldn't be obtained, aborting:
          - coq-mathcomp-ssreflect.1.14.0: curl error code 500
trueNo files were installed.
true