{
  stdenv,
  fetchurl,
  fetchFromGitHub,
  buildPackages,
  lib,
  self,
  version,
  sha256,
  pkgsBuildBuild,
  pkgsBuildHost,
  pkgsBuildTarget,
  pkgsHostHost,
  pkgsTargetTarget,
  zlib,
  config,
  passthruFun,
  perlAttr ? "perl${lib.versions.major version}${lib.versions.minor version}",
  enableThreading ? true,
  coreutils,
  makeWrapper,
  enableCrypt ? true,
  libxcrypt ? null,
  overrides ? config.perlPackageOverrides or (p: { }), # TODO: (self: super: {}) like in python
}@inputs:

# Note: this package is used for bootstrapping fetchurl, and thus
# cannot use fetchpatch! All mutable patches (generated by GitHub or
# cgit) that are needed here should be included directly in Nixpkgs as
# files.

assert (enableCrypt -> (libxcrypt != null));

let
  crossCompiling = stdenv.buildPlatform != stdenv.hostPlatform;
  libc = if stdenv.cc.libc or null != null then stdenv.cc.libc else "/usr";
  libcInc = lib.getDev libc;
  libcLib = lib.getLib libc;
in

stdenv.mkDerivation (
  rec {
    inherit version;
    pname = "perl";

    src = fetchurl {
      url = "mirror://cpan/src/5.0/perl-${version}.tar.gz";
      inherit sha256;
    };

    strictDeps = true;
    # TODO: Add a "dev" output containing the header files.
    outputs = [
      "out"
      "man"
      "devdoc"
    ] ++ lib.optional crossCompiling "mini";
    setOutputFlags = false;

    # On FreeBSD, if Perl is built with threads support, having
    # libxcrypt available will result in a build failure, because
    # perl.h will get conflicting definitions of struct crypt_data
    # from libc's unistd.h and libxcrypt's crypt.h.
    #
    # FreeBSD Ports has the same issue building the perl port if
    # the libxcrypt port has been installed.
    #
    # Without libxcrypt, Perl will still find FreeBSD's crypt functions.
    propagatedBuildInputs = lib.optional (enableCrypt && !stdenv.isFreeBSD) libxcrypt;

    disallowedReferences = [ stdenv.cc ];

    patches =
      # Enable TLS/SSL verification in HTTP::Tiny by default
      lib.optional (lib.versionOlder version "5.38.0") ./http-tiny-verify-ssl-by-default.patch

      # Do not look in /usr etc. for dependencies.
      ++ lib.optional (lib.versionOlder version "5.38.0") ./no-sys-dirs-5.31.patch
      ++ lib.optional (lib.versionAtLeast version "5.38.0") ./no-sys-dirs-5.38.0.patch

      ++ lib.optional stdenv.isSunOS ./ld-shared.patch
      ++ lib.optionals stdenv.isDarwin [
        ./cpp-precomp.patch
        ./sw_vers.patch
      ]
      ++ lib.optional crossCompiling ./cross.patch;

    # This is not done for native builds because pwd may need to come from
    # bootstrap tools when building bootstrap perl.
    postPatch =
      (
        if crossCompiling then
          ''
            substituteInPlace dist/PathTools/Cwd.pm \
              --replace "/bin/pwd" '${coreutils}/bin/pwd'
            substituteInPlace cnf/configure_tool.sh --replace "cc -E -P" "cc -E"
          ''
        else
          ''
            substituteInPlace dist/PathTools/Cwd.pm \
              --replace "/bin/pwd" "$(type -P pwd)"
          ''
      )
      +
        # Perl's build system uses the src variable, and its value may end up in
        # the output in some cases (when cross-compiling)
        ''
          unset src
        '';

    # Build a thread-safe Perl with a dynamic libperl.so.  We need the
    # "installstyle" option to ensure that modules are put under
    # $out/lib/perl5 - this is the general default, but because $out
    # contains the string "perl", Configure would select $out/lib.
    # Miniperl needs -lm. perl needs -lrt.
    configureFlags =
      (
        if crossCompiling then
          [
            "-Dlibpth=\"\""
            "-Dglibpth=\"\""
            "-Ddefault_inc_excludes_dot"
          ]
        else
          [
            "-de"
            "-Dcc=cc"
          ]
      )
      ++ [
        "-Uinstallusrbinperl"
        "-Dinstallstyle=lib/perl5"
      ]
      ++ lib.optional (!crossCompiling) "-Duseshrplib"
      ++ [
        "-Dlocincpth=${libcInc}/include"
        "-Dloclibpth=${libcLib}/lib"
      ]
      ++ lib.optionals ((builtins.match ''5\.[0-9]*[13579]\..+'' version) != null) [
        "-Dusedevel"
        "-Uversiononly"
      ]
      ++ lib.optional stdenv.isSunOS "-Dcc=gcc"
      ++ lib.optional enableThreading "-Dusethreads"
      ++ lib.optional (!enableCrypt) "-A clear:d_crypt_r"
      ++ lib.optional stdenv.hostPlatform.isStatic "--all-static"
      ++ lib.optionals (!crossCompiling) [
        "-Dprefix=${placeholder "out"}"
        "-Dman1dir=${placeholder "out"}/share/man/man1"
        "-Dman3dir=${placeholder "out"}/share/man/man3"
      ];

    configureScript = lib.optionalString (!crossCompiling) "${stdenv.shell} ./Configure";

    dontAddStaticConfigureFlags = true;

    dontAddPrefix = !crossCompiling;

    enableParallelBuilding = !crossCompiling;

    # perl includes the build date, the uname of the build system and the
    # username of the build user in some files.
    # We override these to make it build deterministically.
    # other distro solutions
    # https://github.com/bmwiedemann/openSUSE/blob/master/packages/p/perl/perl-reproducible.patch
    # https://github.com/archlinux/svntogit-packages/blob/packages/perl/trunk/config.over
    # https://salsa.debian.org/perl-team/interpreter/perl/blob/debian-5.26/debian/config.over
    # A ticket has been opened upstream to possibly clean some of this up: https://rt.perl.org/Public/Bug/Display.html?id=133452
    preConfigure =
      ''
        cat > config.over <<EOF
        ${lib.optionalString (
          stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isGnu
        ) ''osvers="gnulinux"''}
        myuname="nixpkgs"
        myhostname="nixpkgs"
        cf_by="nixpkgs"
        cf_time="$(date -d "@$SOURCE_DATE_EPOCH")"
        EOF

        # Compress::Raw::Zlib should use our zlib package instead of the one
        # included with the distribution
        cat > ./cpan/Compress-Raw-Zlib/config.in <<EOF
        BUILD_ZLIB   = False
        INCLUDE      = ${zlib.dev}/include
        LIB          = ${zlib.out}/lib
        OLD_ZLIB     = False
        GZIP_OS_CODE = AUTO_DETECT
        USE_ZLIB_NG  = False
        EOF
      ''
      + lib.optionalString stdenv.isDarwin ''
        substituteInPlace hints/darwin.sh --replace "env MACOSX_DEPLOYMENT_TARGET=10.3" ""
      ''
      + lib.optionalString (!enableThreading) ''
        # We need to do this because the bootstrap doesn't have a static libpthread
        sed -i 's,\(libswanted.*\)pthread,\1,g' Configure
      '';

    # Default perl does not support --host= & co.
    configurePlatforms = [ ];

    setupHook = ./setup-hook.sh;

    # copied from python
    passthru =
      let
        # When we override the interpreter we also need to override the spliced versions of the interpreter
        inputs' = lib.filterAttrs (n: v: !lib.isDerivation v && n != "passthruFun") inputs;
        override =
          attr:
          let
            perl = attr.override (inputs' // { self = perl; });
          in
          perl;
      in
      passthruFun rec {
        inherit self perlAttr;
        inherit overrides;
        perlOnBuildForBuild = override pkgsBuildBuild.${perlAttr};
        perlOnBuildForHost = override pkgsBuildHost.${perlAttr};
        perlOnBuildForTarget = override pkgsBuildTarget.${perlAttr};
        perlOnHostForHost = override pkgsHostHost.${perlAttr};
        perlOnTargetForTarget =
          if lib.hasAttr perlAttr pkgsTargetTarget then (override pkgsTargetTarget.${perlAttr}) else { };
      };

    doCheck = false; # some tests fail, expensive

    # TODO: it seems like absolute paths to some coreutils is required.
    postInstall =
      ''
        # Remove dependency between "out" and "man" outputs.
        rm "$out"/lib/perl5/*/*/.packlist

        # Remove dependencies on glibc and gcc
        sed "/ *libpth =>/c    libpth => ' '," \
          -i "$out"/lib/perl5/*/*/Config.pm
        # TODO: removing those paths would be cleaner than overwriting with nonsense.
        substituteInPlace "$out"/lib/perl5/*/*/Config_heavy.pl \
          --replace "${libcInc}" /no-such-path \
          --replace "${if stdenv.hasCC then stdenv.cc else "/no-such-path"}" /no-such-path \
          --replace "${
            if stdenv.hasCC && stdenv.cc.cc != null then stdenv.cc.cc else "/no-such-path"
          }" /no-such-path \
          --replace "$man" /no-such-path
      ''
      + lib.optionalString crossCompiling ''
        mkdir -p $mini/lib/perl5/cross_perl/${version}
        for dir in cnf/{stub,cpan}; do
          cp -r $dir/* $mini/lib/perl5/cross_perl/${version}
        done

        mkdir -p $mini/bin
        install -m755 miniperl $mini/bin/perl

        export runtimeArch="$(ls $out/lib/perl5/site_perl/${version})"
        # wrapProgram should use a runtime-native SHELL by default, but
        # it actually uses a buildtime-native one. If we ever fix that,
        # we'll need to fix this to use a buildtime-native one.
        #
        # Adding the arch-specific directory is morally incorrect, as
        # miniperl can't load the native modules there. However, it can
        # (and sometimes needs to) load and run some of the pure perl
        # code there, so we add it anyway. When needed, stubs can be put
        # into $mini/lib/perl5/cross_perl/${version}.
        wrapProgram $mini/bin/perl --prefix PERL5LIB : \
          "$mini/lib/perl5/cross_perl/${version}:$out/lib/perl5/${version}:$out/lib/perl5/${version}/$runtimeArch"
      ''; # */

    meta = with lib; {
      homepage = "https://www.perl.org/";
      description = "The standard implementation of the Perl 5 programming language";
      license = licenses.artistic1;
      maintainers = [ maintainers.eelco ];
      platforms = platforms.all;
      priority = 6; # in `buildEnv' (including the one inside `perl.withPackages') the library files will have priority over files in `perl`
      mainProgram = "perl";
    };
  }
  // lib.optionalAttrs (stdenv.buildPlatform != stdenv.hostPlatform) rec {
    crossVersion = "84db4c71ae3d3b01fb2966cd15a060a7be334710"; # Nov 29, 2023

    perl-cross-src = fetchFromGitHub {
      name = "perl-cross-${crossVersion}";
      owner = "arsv";
      repo = "perl-cross";
      rev = crossVersion;
      sha256 = "sha256-1Zqw4sy/lD2nah0Z8rAE11tSpq1Ym9nBbatDczR+mxs=";
    };

    depsBuildBuild = [
      buildPackages.stdenv.cc
      makeWrapper
    ];

    postUnpack = ''
      unpackFile ${perl-cross-src}
      chmod -R u+w ${perl-cross-src.name}
      cp -R ${perl-cross-src.name}/* perl-${version}/
    '';

    configurePlatforms = [
      "build"
      "host"
      "target"
    ];

    # TODO merge setup hooks
    setupHook = ./setup-hook-cross.sh;
  }
)