{ stdenv, fetchFromGitHub, perl }:

stdenv.mkDerivation rec {
  name = "mbedtls-2.9.0";

  src = fetchFromGitHub {
    owner = "ARMmbed";
    repo = "mbedtls";
    rev = name;
    sha256 = "1pb1my8wwa757hvd06qwidkj58fa1wayf16g98q600xhya5fj3vx";
  };

  nativeBuildInputs = [ perl ];

  postPatch = ''
    patchShebangs .
  '' + stdenv.lib.optionalString stdenv.isDarwin ''
    substituteInPlace library/Makefile --replace "-soname" "-install_name"
    substituteInPlace tests/scripts/run-test-suites.pl --replace "LD_LIBRARY_PATH" "DYLD_LIBRARY_PATH"
    # Necessary for install_name_tool below
    echo "LOCAL_LDFLAGS += -headerpad_max_install_names" >> programs/Makefile
  '';

  makeFlags = [
    "SHARED=1"
  ] ++ stdenv.lib.optionals stdenv.isDarwin [
    "DLEXT=dylib"
  ];

  installFlags = [
    "DESTDIR=\${out}"
  ];

  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
    install_name_tool -change libmbedcrypto.dylib $out/lib/libmbedcrypto.dylib $out/lib/libmbedtls.dylib
    install_name_tool -change libmbedcrypto.dylib $out/lib/libmbedcrypto.dylib $out/lib/libmbedx509.dylib
    install_name_tool -change libmbedx509.dylib $out/lib/libmbedx509.dylib $out/lib/libmbedtls.dylib

    for exe in $out/bin/*; do
      if [[ $exe != *.sh ]]; then
        install_name_tool -change libmbedtls.dylib $out/lib/libmbedtls.dylib $exe
        install_name_tool -change libmbedx509.dylib $out/lib/libmbedx509.dylib $exe
        install_name_tool -change libmbedcrypto.dylib $out/lib/libmbedcrypto.dylib $exe
      fi
    done
  '';

  doCheck = true;

  meta = with stdenv.lib; {
    homepage = https://tls.mbed.org/;
    description = "Portable cryptographic and SSL/TLS library, aka polarssl";
    license = licenses.gpl3;
    platforms = platforms.all;
    maintainers = with maintainers; [ wkennington fpletz ];
  };
}