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{ lib, stdenv, fetchurl, bison, pkg-config, glib, gettext, perl, libgdiplus, libX11, callPackage, ncurses, zlib, bash
, withLLVM ? false, cacert, Foundation, libobjc, python3, version, sha256, autoconf, libtool, automake, cmake, which
, gnumake42
, enableParallelBuilding ? true
, srcArchiveSuffix ? "tar.bz2"
, extraPatches ? []
}:

let
  llvm = callPackage ./llvm.nix { };
in
stdenv.mkDerivation rec {
  pname = "mono";
  inherit version;

  src = fetchurl {
    inherit sha256;
    url = "https://download.mono-project.com/sources/mono/${pname}-${version}.${srcArchiveSuffix}";
  };

  strictDeps = true;
  nativeBuildInputs = [
    autoconf
    automake
    bison
    cmake
    libtool
    perl
    pkg-config
    python3
    which
    gnumake42
  ];
  buildInputs = [
    glib
    gettext
    libgdiplus
    libX11
    ncurses
    zlib
    bash
  ] ++ lib.optionals stdenv.isDarwin [ Foundation libobjc ];

  configureFlags = [
    "--x-includes=${libX11.dev}/include"
    "--x-libraries=${libX11.out}/lib"
    "--with-libgdiplus=${libgdiplus}/lib/libgdiplus.so"
  ] ++ lib.optionals withLLVM [
    "--enable-llvm"
    "--with-llvm=${llvm}"
  ];

  configurePhase = ''
    patchShebangs autogen.sh mcs/build/start-compiler-server.sh
    ./autogen.sh --prefix $out $configureFlags
  '';

  # We want pkg-config to take priority over the dlls in the Mono framework and the GAC
  # because we control pkg-config
  patches = [ ./pkgconfig-before-gac.patch ] ++ extraPatches;

  # Patch all the necessary scripts. Also, if we're using LLVM, we fix the default
  # LLVM path to point into the Mono LLVM build, since it's private anyway.
  preBuild = ''
    makeFlagsArray=(INSTALL=`type -tp install`)
    substituteInPlace mcs/class/corlib/System/Environment.cs --replace /usr/share "$out/share"
  '' + lib.optionalString withLLVM ''
    substituteInPlace mono/mini/aot-compiler.c --replace "llvm_path = g_strdup (\"\")" "llvm_path = g_strdup (\"${llvm}/bin/\")"
  '';

  # Fix mono DLLMap so it can find libX11 to run winforms apps
  # libgdiplus is correctly handled by the --with-libgdiplus configure flag
  # Other items in the DLLMap may need to be pointed to their store locations, I don't think this is exhaustive
  # https://www.mono-project.com/Config_DllMap
  postBuild = ''
    find . -name 'config' -type f | xargs \
    sed -i -e "s@libX11.so.6@${libX11.out}/lib/libX11.so.6@g"
  '';

  # Without this, any Mono application attempting to open an SSL connection will throw with
  # The authentication or decryption has failed.
  # ---> Mono.Security.Protocol.Tls.TlsException: Invalid certificate received from server.
  postInstall = ''
    echo "Updating Mono key store"
    $out/bin/cert-sync ${cacert}/etc/ssl/certs/ca-bundle.crt
  ''
  # According to [1], gmcs is just mcs
  # [1] https://github.com/mono/mono/blob/master/scripts/gmcs.in
  + ''
    ln -s $out/bin/mcs $out/bin/gmcs
  '';

  inherit enableParallelBuilding;

  meta = with lib; {
    # Per nixpkgs#151720 the build failures for aarch64-darwin are fixed since 6.12.0.129
    broken = stdenv.isDarwin && stdenv.isAarch64 && lib.versionOlder version "6.12.0.129";
    homepage = "https://mono-project.com/";
    description = "Cross platform, open source .NET development framework";
    platforms = with platforms; darwin ++ linux;
    maintainers = with maintainers; [ thoughtpolice obadz ];
    license = with licenses; [
      /* runtime, compilers, tools and most class libraries licensed */ mit
      /* runtime includes some code licensed */ bsd3
      /* mcs/class/I18N/mklist.sh marked GPLv2 and others just GPL */ gpl2Only
      /* RabbitMQ.Client class libraries dual licensed */ mpl20 asl20
      /* mcs/class/System.Core/System/TimeZoneInfo.Android.cs */ asl20
      /* some documentation */ mspl
      # https://www.mono-project.com/docs/faq/licensing/
      # https://github.com/mono/mono/blob/main/LICENSE
    ];
  };
}