{ lib
, stdenv
, fetchurl
, fetchpatch
, libtool
, autoconf
, automake
, gmp
, mpfr
, libffi
, makeWrapper
, noUnicode ? false
, gcc
, threadSupport ? false
, useBoehmgc ? true
, boehmgc
}:

stdenv.mkDerivation rec {
  pname = "ecl";
  version = "16.1.2";

  src = fetchurl {
    url = "https://common-lisp.net/project/ecl/static/files/release/ecl-${version}.tgz";
    sha256 = "sha256-LUgrGgpPvV2IFDRRcDInnYCMtkBeIt2R721zNTRGS5k=";
  };

  buildInputs = [
    libtool
    autoconf
    automake
    makeWrapper
  ];
  propagatedBuildInputs = [
    libffi
    gmp
    mpfr
    gcc
  ] ++ lib.optionals useBoehmgc [
    # replaces ecl's own gc which other packages can depend on, thus propagated
    boehmgc
  ];

  configureFlags = [
    (if threadSupport then "--enable-threads" else "--disable-threads")
    "--with-gmp-incdir=${lib.getDev gmp}/include"
    "--with-gmp-libdir=${lib.getLib gmp}/lib"
    # -incdir, -libdir doesn't seem to be supported for libffi
    "--with-libffi-prefix=${lib.getDev libffi}"
  ] ++ lib.optional (! noUnicode) "--enable-unicode"
  ;

  patches = [
    (fetchpatch {
      # Avoid infinite loop, see https://gitlab.com/embeddable-common-lisp/ecl/issues/43 (fixed upstream)
      name = "avoid-infinite-loop.patch";
      url = "https://gitlab.com/embeddable-common-lisp/ecl/commit/caba1989f40ef917e7486f41b9cd5c7e3c5c2d79.patch";
      sha256 = "07vw91psbc9gdn8grql46ra8lq3bgkzg5v480chnbryna4sv6lbb";
    })
    (fetchpatch {
      # Fix getcwd with long pathnames
      # Rebased version of
      # https://gitlab.com/embeddable-common-lisp/ecl/commit/ac5f011f57a85a38627af154bc3ee7580e7fecd4.patch
      name = "getcwd.patch";
      url = "https://git.sagemath.org/sage.git/plain/build/pkgs/ecl/patches/16.1.2-getcwd.patch?id=07d6c37d18811e2b377a9689790a7c5e24da16ba";
      sha256 = "1fbi8gn7rv8nqff5mpaijsrch3k3z7qc5cn4h1vl8qrr8xwqlqhb";
    })
    ./ecl-1.16.2-libffi-3.3-abi.patch
  ];

  hardeningDisable = [ "format" ];

  postInstall = ''
    sed -e 's/@[-a-zA-Z_]*@//g' -i $out/bin/ecl-config
    wrapProgram "$out/bin/ecl" \
      --prefix PATH ':' "${
        lib.makeBinPath [
          gcc                   # for the C compiler
          gcc.bintools.bintools # for ar
        ]
      }" \
  ''
  # ecl 16.1.2 is too old to have -libdir for libffi and boehmgc, so we need to
  # use NIX_LDFLAGS_BEFORE to make gcc find these particular libraries.
  # Since it is missing even the prefix flag for boehmgc we also need to inject
  # the correct -I flag via NIX_CFLAGS_COMPILE. Since we have access to it, we
  # create the variables with suffixSalt (which seems to be necessary for
  # NIX_CFLAGS_COMPILE even).
  + lib.optionalString useBoehmgc ''
    --prefix NIX_CFLAGS_COMPILE_${gcc.suffixSalt} ' ' "-I${lib.getDev boehmgc}/include" \
    --prefix NIX_LDFLAGS_BEFORE_${gcc.bintools.suffixSalt} ' ' "-L${lib.getLib boehmgc}/lib" \
  '' + ''
    --prefix NIX_LDFLAGS_BEFORE_${gcc.bintools.suffixSalt} ' ' "-L${lib.getLib libffi}/lib"
  '';

  meta = with lib; {
    description = "Lisp implementation aiming to be small, fast and easy to embed";
    license = licenses.mit;
    maintainers = with maintainers; [ raskin ];
    platforms = platforms.unix;
  };
}