{ lib,
  mkCoqDerivation, single ? false,
  coq, equations, version ? null }@args:

let
  repo  = "metacoq";
  owner = "MetaCoq";
  defaultVersion = lib.switch coq.coq-version [
      { case = "8.11"; out = "1.0-beta2-8.11"; }
      { case = "8.12"; out = "1.0-beta2-8.12"; }
      # Do not provide 8.13 because it does not compile with equations 1.3 provided by default (only 1.2.3)
      # { case = "8.13"; out = "1.0-beta2-8.13"; }
      { case = "8.14"; out = "1.1-8.14"; }
      { case = "8.15"; out = "1.1-8.15"; }
      { case = "8.16"; out = "1.1-8.16"; }
      { case = "8.17"; out = "1.3.1-8.17"; }
      { case = "8.18"; out = "1.3.1-8.18"; }
      { case = "8.19"; out = "1.3.2-8.19"; }
      { case = "8.20"; out = "1.3.2-8.20"; }
    ] null;
  release = {
    "1.0-beta2-8.11".sha256 = "sha256-I9YNk5Di6Udvq5/xpLSNflfjRyRH8fMnRzbo3uhpXNs=";
    "1.0-beta2-8.12".sha256 = "sha256-I8gpmU9rUQJh0qfp5KOgDNscVvCybm5zX4TINxO1TVA=";
    "1.0-beta2-8.13".sha256 = "sha256-IC56/lEDaAylUbMCfG/3cqOBZniEQk8jmI053DBO5l8=";
    "1.0-8.14".sha256 = "sha256-iRnaNeHt22JqxMNxOGPPycrO9EoCVjusR2s0GfON1y0=";
    "1.0-8.15".sha256 = "sha256-8RUC5dHNfLJtJh+IZG4nPTAVC8ZKVh2BHedkzjwLf/k=";
    "1.0-8.16".sha256 = "sha256-7rkCAN4PNnMgsgUiiLe2TnAliknN75s2SfjzyKCib/o=";
    "1.1-8.14".sha256 = "sha256-6vViCNQl6BnGgOHX3P/OLfFXN4aUfv4RbDokfz2BgQI=";
    "1.1-8.15".sha256 = "sha256-qCD3wFW4E+8vSVk4XoZ0EU4PVya0al+JorzS9nzmR/0=";
    "1.1-8.16".sha256 = "sha256-cTK4ptxpPPlqxAhasZFX3RpSlsoTZwhTqs2A3BZy9sA=";
    "1.2.1-8.17".sha256 = "sha256-FP4upuRsG8B5Q5FIr76t+ecRirrOUX0D1QiLq0/zMyE=";
    "1.2.1-8.18".sha256 = "sha256-49g5db2Bv8HpltptJdxA7zrmgNFGC6arx5h2mKHhrko=";
    "1.3.1-8.17".sha256 = "sha256-l0/QLC7V3zSk/FsaE2eL6tXy2BzbcI5MAk/c+FESwnc=";
    "1.3.1-8.18".sha256 = "sha256-L6Ym4Auwqaxv5tRmJLSVC812dxCqdUU5aN8+t5HVYzY=";
    "1.3.1-8.19".sha256 = "sha256-fZED/Uel1jt5XF83dR6HfyhSkfBdLkET8C/ArDgsm64=";
    "1.3.2-8.19".sha256 = "sha256-e5Pm1AhaQrO6JoZylSXYWmeXY033QflQuCBZhxGH8MA=";
    "1.3.2-8.20".sha256 = "sha256-4J7Ly4Fc2E/I6YqvzTLntVVls5t94OUOjVMKJyyJdw8=";
  };
  releaseRev = v: "v${v}";

  # list of core metacoq packages and their dependencies
  packages = {
    "utils"              = [];
    "common"             = [ "utils" ];
    "template-coq"       = [ "common" ];
    "pcuic"              = if (lib.versionAtLeast coq.coq-version "8.17" || coq.coq-version == "dev")
                           then [ "common" ]
                           else [ "template-coq" ];
    "safechecker"        = [ "pcuic" ];
    "template-pcuic"     = [ "template-coq" "pcuic" ];
    "erasure"            = [ "safechecker" "template-pcuic" ];
    "quotation"          = [ "template-coq" "pcuic" "template-pcuic" ];
    "safechecker-plugin" = [ "template-pcuic" "safechecker" ];
    "erasure-plugin"     = [ "template-pcuic" "erasure" ];
    "translations"       = [ "template-coq" ];
    "all"                = [ "safechecker-plugin" "erasure-plugin" "translations" "quotation" ];
  };

  template-coq = metacoq_ "template-coq";

  metacoq_ = package: let
      metacoq-deps = lib.optionals (package != "single") (map metacoq_ packages.${package});
      pkgpath = if package == "single" then "./" else "./${package}";
      pname = if package == "all" then "metacoq" else "metacoq-${package}";
      pkgallMake = ''
          mkdir all
          echo "all:" > all/Makefile
          echo "install:" >> all/Makefile
        '' ;
      derivation = (mkCoqDerivation ({
        inherit version pname defaultVersion release releaseRev repo owner;

        mlPlugin = true;
        propagatedBuildInputs = [ equations coq.ocamlPackages.zarith ] ++ metacoq-deps;

        patchPhase = if lib.versionAtLeast coq.coq-version "8.17" || coq.coq-version == "dev" then ''
          patchShebangs ./configure.sh
          patchShebangs ./template-coq/update_plugin.sh
          patchShebangs ./template-coq/gen-src/to-lower.sh
          patchShebangs ./safechecker-plugin/clean_extraction.sh
          patchShebangs ./erasure-plugin/clean_extraction.sh
          echo "CAMLFLAGS+=-w -60 # Unused module" >> ./safechecker/Makefile.plugin.local
          sed -i -e 's/mv $i $newi;/mv $i tmp; mv tmp $newi;/' ./template-coq/gen-src/to-lower.sh ./safechecker-plugin/clean_extraction.sh ./erasure-plugin/clean_extraction.sh
        '' else ''
          patchShebangs ./configure.sh
          patchShebangs ./template-coq/update_plugin.sh
          patchShebangs ./template-coq/gen-src/to-lower.sh
          patchShebangs ./pcuic/clean_extraction.sh
          patchShebangs ./safechecker/clean_extraction.sh
          patchShebangs ./erasure/clean_extraction.sh
          echo "CAMLFLAGS+=-w -60 # Unused module" >> ./safechecker/Makefile.plugin.local
          sed -i -e 's/mv $i $newi;/mv $i tmp; mv tmp $newi;/' ./template-coq/gen-src/to-lower.sh ./pcuic/clean_extraction.sh ./safechecker/clean_extraction.sh ./erasure/clean_extraction.sh
        '' ;

        configurePhase = lib.optionalString (package == "all") pkgallMake + ''
          touch ${pkgpath}/metacoq-config
        '' + lib.optionalString (lib.elem package ["erasure" "template-pcuic" "quotation" "safechecker-plugin" "erasure-plugin" "translations"]) ''
          echo  "-I ${template-coq}/lib/coq/${coq.coq-version}/user-contrib/MetaCoq/Template/" > ${pkgpath}/metacoq-config
        '' + lib.optionalString (package == "single") ''
          ./configure.sh local
        '';

        preBuild = ''
          cd ${pkgpath}
        '' ;

        meta = {
          homepage    = "https://metacoq.github.io/";
          license     = lib.licenses.mit;
          maintainers = with lib.maintainers; [ cohencyril ];
        };
      } // lib.optionalAttrs (package != "single")
        { passthru = lib.mapAttrs (package: deps: metacoq_ package) packages; })
      ).overrideAttrs (o:
        let requiresOcamlStdlibShims = lib.versionAtLeast o.version "1.0-8.16" ||
                                       (o.version == "dev" && (lib.versionAtLeast coq.coq-version "8.16" || coq.coq-version == "dev")) ;
        in
          {
            propagatedBuildInputs = o.propagatedBuildInputs ++ lib.optional requiresOcamlStdlibShims coq.ocamlPackages.stdlib-shims;
          });
      # utils, common, template-pcuic, quotation, safechecker-plugin, and erasure-plugin
      # packages didn't exist before 1.2, so bulding nothing in that case
      patched-derivation = derivation.overrideAttrs (o:
        lib.optionalAttrs (o.pname != null &&
          lib.elem package [ "utils" "common" "template-pcuic" "quotation" "safechecker-plugin" "erasure-plugin" ] &&
          o.version != null && o.version != "dev" && lib.versions.isLt "1.2" o.version)
        { patchPhase = ""; configurePhase = ""; preBuild = ""; buildPhase = "echo doing nothing"; installPhase = "echo doing nothing"; }
      );
  in patched-derivation;
in
metacoq_ (if single then "single" else "all")