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{ stdenv, fetchurl, bison, pkgconfig, glib, gettext, perl, libgdiplus, libX11, callPackage, ncurses, zlib, withLLVM ? false, cacert, Foundation, libobjc, python, version, sha256, autoconf, libtool, automake, cmake, which
, 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}";
  };

  buildInputs =
    [ bison pkgconfig glib gettext perl libgdiplus libX11 ncurses zlib python autoconf libtool automake cmake which
    ]
    ++ (stdenv.lib.optionals stdenv.isDarwin [ Foundation libobjc ]);

  propagatedBuildInputs = [glib];

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

  configurePhase = ''
    patchShebangs ./
    ./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 "$out/share"
  '' + stdenv.lib.optionalString withLLVM ''
    substituteInPlace mono/mini/aot-compiler.c --replace "llvm_path = g_strdup (\"\")" "llvm_path = g_strdup (\"${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 stdenv.lib; {
    homepage = "https://mono-project.com/";
    description = "Cross platform, open source .NET development framework";
    platforms = with platforms; darwin ++ linux;
    maintainers = with maintainers; [ thoughtpolice obadz vrthra ];
    license = licenses.free; # Combination of LGPL/X11/GPL ?
  };
}