{
  lib,
  mkCoqDerivation,
  coq,
  stdlib,
  version ? null,
}:

(mkCoqDerivation {
  pname = "equations";
  owner = "mattam82";
  repo = "Coq-Equations";
  opam-name = "rocq-equations";
  inherit version;
  defaultVersion =
    let
      case = case: out: { inherit case out; };
    in
    lib.switch coq.coq-version [
      (case "9.1" "1.3.1+9.1")
      (case "9.0" "1.3.1+9.0")
      (case "8.20" "1.3.1+8.20")
      (case "8.19" "1.3+8.19")
      (case "8.18" "1.3+8.18")
      (case "8.17" "1.3+8.17")
      (case "8.16" "1.3+8.16")
      (case "8.15" "1.3+8.15")
      (case "8.14" "1.3+8.14")
      (case "8.13" "1.3+8.13")
      (case "8.12" "1.2.4+coq8.12")
      (case "8.11" "1.2.4+coq8.11")
      (case "8.10" "1.2.1+coq8.10-2")
      (case "8.9" "1.2.1+coq8.9")
      (case "8.8" "1.2+coq8.8")
      (case "8.7" "1.0+coq8.7")
      (case "8.6" "1.0+coq8.6")
    ] null;

  release."1.0+coq8.6".version = "1.0";
  release."1.0+coq8.6".rev = "v1.0";
  release."1.0+coq8.6".sha256 = "19ylw9v9g35607w4hm86j7mmkghh07hmkc1ls5bqlz3dizh5q4pj";
  release."1.0+coq8.7".version = "1.0";
  release."1.0+coq8.7".rev = "v1.0-8.7";
  release."1.0+coq8.7".sha256 = "1bavg4zl1xn0jqrdq8iw7xqzdvdf39ligj9saz5m9c507zri952h";
  release."1.2+coq8.8".version = "1.2";
  release."1.2+coq8.8".rev = "v1.2-8.8";
  release."1.2+coq8.8".sha256 = "06452fyzalz7zcjjp73qb7d6xvmqb6skljkivf8pfm55fsc8s7kx";
  release."1.2.1+coq8.9".version = "1.2.1";
  release."1.2.1+coq8.9".rev = "v1.2.1-8.9";
  release."1.2.1+coq8.9".sha256 = "0d8ddj6nc6p0k25cd8fs17cq427zhzbc3v9pk2wd2fnvk70nlfij";
  release."1.2.1+coq8.10-2".version = "1.2.1";
  release."1.2.1+coq8.10-2".rev = "v1.2.1-8.10-2";
  release."1.2.1+coq8.10-2".sha256 = "0j3z4l5nrbyi9zbbyqkc6kassjanwld2188mwmrbqspaypm2ys68";
  release."1.2.3+coq8.11".version = "1.2.3";
  release."1.2.3+coq8.11".rev = "v1.2.3-8.11";
  release."1.2.3+coq8.11".sha256 = "1srxz1rws8jsh7402g2x2vcqgjbbsr64dxxj5d2zs48pmhb20csf";
  release."1.2.3+coq8.12".version = "1.2.3";
  release."1.2.3+coq8.12".rev = "v1.2.3-8.12";
  release."1.2.3+coq8.12".sha256 = "1y0jkvzyz5ssv5vby41p1i8zs7nsdc8g3pzyq73ih9jz8h252643";
  release."1.2.4+coq8.11".rev = "v1.2.4-8.11";
  release."1.2.4+coq8.11".sha256 = "01fihyav8jbjinycgjc16adpa0zy5hcav5mlkf4s9zvqxka21i52";
  release."1.2.4+coq8.12".rev = "v1.2.4-8.12";
  release."1.2.4+coq8.12".sha256 = "1n0w8is464qcq8mk2mv7amaf0khbjz5mpc9phf0rhpjm0lb22cb3";
  release."1.2.4+coq8.13".rev = "v1.2.4-8.13";
  release."1.2.4+coq8.13".sha256 = "0i014lshsdflzw6h0qxra9d2f0q82vffxv2f29awbb9ad0p4rq4q";
  release."1.3+8.13".rev = "v1.3-8.13";
  release."1.3+8.13".sha256 = "1jwjbkkkk4bwf6pz4zzz8fy5bb17aqyf4smkja59rgj9ya6nrdhg";
  release."1.3+8.14".rev = "v1.3-8.14";
  release."1.3+8.14".sha256 = "19bj9nncd1r9g4273h5qx35gs3i4bw5z9bhjni24b413hyj55hkv";
  release."1.3+8.15".rev = "v1.3-8.15";
  release."1.3+8.15".sha256 = "1vfcfpsp9zyj0sw0cwibk76nj6n0r6gwh8m1aa3lbvc0b1kbm32k";
  release."1.3+8.16".rev = "v1.3-8.16";
  release."1.3+8.16".sha256 = "sha256-zyMGeRObtSGWh7n3WCqesBZL5EgLvKwmnTy09rYpxyE=";
  release."1.3+8.17".rev = "v1.3-8.17";
  release."1.3+8.17".sha256 = "sha256-yNotSIxFkhTg3reZIchGQ7cV9WmTJ7p7hPfKGBiByDw=";
  release."1.3+8.18".rev = "v1.3-8.18";
  release."1.3+8.18".sha256 = "sha256-8MZO9vWdr8wlAov0lBTYMnde0RuMyhaiM99zp7Zwfao=";
  release."1.3+8.19".rev = "v1.3-8.19";
  release."1.3+8.19".sha256 = "sha256-roBCWfAHDww2Z2JbV5yMI3+EOfIsv3WvxEcUbBiZBsk=";
  release."1.3.1+8.20".rev = "v1.3.1-8.20";
  release."1.3.1+8.20".sha256 = "sha256-u8LB1KiACM5zVaoL7dSdHYvZgX7pf30VuqtjLLGuTzc=";
  release."1.3.1+9.0".rev = "v1.3.1-9.0";
  release."1.3.1+9.0".sha256 = "sha256-186Z0/wCuGAjIvG1LoYBMPooaC6HmnKWowYXuR0y6bA=";
  release."1.3.1+9.1".rev = "v1.3.1-9.1";
  release."1.3.1+9.1".sha256 = "sha256-LtYbAR3jt+JbYcqP+m1n3AZhAWSMIeOZtmdSJwg7L1A=";

  mlPlugin = true;

  useDuneifVersion = v: v != null && (v == "dev" || lib.versionAtLeast v "1.3.1+9.0");

  propagatedBuildInputs = [ stdlib ];

  meta = {
    homepage = "https://mattam82.github.io/Coq-Equations/";
    description = "Plugin for Coq to add dependent pattern-matching";
    maintainers = with lib.maintainers; [ jwiegley ];
  };
}).overrideAttrs
  (
    o:
    if o.version != null && o.version != "dev" && !(lib.versionAtLeast o.version "1.3.1+9.0") then
      {
        preBuild = "coq_makefile -f _CoqProject -o Makefile${
          lib.optionalString (lib.versionAtLeast o.version "1.2.1" || o.version == "dev") ".coq"
        }";
      }
    else
      {
        propagatedBuildInputs = o.propagatedBuildInputs ++ [ coq.ocamlPackages.ppx_optcomp ];
      }
  )