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

(mkCoqDerivation {
  pname = "equations";
  owner = "mattam82";
  repo = "Coq-Equations";
  inherit version;
  defaultVersion = lib.switch coq.coq-version [
    { case = "8.16"; out = "1.3+8.16"; }
    { case = "8.15"; out = "1.3+8.15"; }
    { case = "8.14"; out = "1.3+8.14"; }
    { case = "8.13"; out = "1.3+8.13"; }
    { case = "8.12"; out = "1.2.4+coq8.12"; }
    { case = "8.11"; out = "1.2.4+coq8.11"; }
    { case = "8.10"; out = "1.2.1+coq8.10-2"; }
    { case = "8.9";  out = "1.2.1+coq8.9"; }
    { case = "8.8";  out = "1.2+coq8.8"; }
    { case = "8.7";  out = "1.0+coq8.7"; }
    { case = "8.6";  out = "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=";

  mlPlugin = true;

  meta = with lib; {
    homepage = "https://mattam82.github.io/Coq-Equations/";
    description = "A plugin for Coq to add dependent pattern-matching";
    maintainers = with maintainers; [ jwiegley ];
  };
}).overrideAttrs (o: {
  preBuild = "coq_makefile -f _CoqProject -o Makefile${lib.optionalString (lib.versionAtLeast o.version "1.2.1" || o.version == "dev") ".coq"}";
})