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{ stdenv, fetchurl, fetchpatch, zlib, openssl, perl, libedit, pkgconfig, pam, autoreconfHook
, etcDir ? null
, hpnSupport ? false
, withKerberos ? false
, withGssapiPatches ? false
, kerberos
, linkOpenssl? true
}:

assert withKerberos -> kerberos != null;
assert withGssapiPatches -> withKerberos;

let

  # **please** update this patch when you update to a new openssh release.
  gssapiPatch = fetchpatch {
    name = "openssh-gssapi.patch";
    url = "https://anonscm.debian.org/cgit/pkg-ssh/openssh.git/plain/debian"
        + "/patches/gssapi.patch?id=1e0d55f9163793742d20eaadd4784db16fd3459d";
    sha256 = "130phj87q87p9crigd6852nnaqsqkfg09h45a32lk4524h9kkxgb";
  };

in
with stdenv.lib;
stdenv.mkDerivation rec {
  # Please ensure that openssh_with_kerberos still builds when
  # bumping the version here!
  name = "openssh-${version}";
  version = if hpnSupport then "7.5p1" else "7.6p1";

  src = if hpnSupport then
      fetchurl {
        url = "https://github.com/rapier1/openssh-portable/archive/hpn-KitchenSink-7_5_P1.tar.gz";
        sha256 = "1hasdcfjl6xf5nbbbvqyyq5v7ad10nywrq89j7naxz9wln58nhnn";
      }
    else
      fetchurl {
        url = "mirror://openbsd/OpenSSH/portable/${name}.tar.gz";
        sha256 = "08qpsb8mrzcx8wgvz9insiyvq7sbg26yj5nvl2m5n57yvppcl8x3";
      };

  patches =
    [
      ./locale_archive.patch
      ./fix-host-key-algorithms-plus.patch

      # See discussion in https://github.com/NixOS/nixpkgs/pull/16966
      ./dont_create_privsep_path.patch
    ]
    ++ optional withGssapiPatches gssapiPatch;

  postPatch =
    # On Hydra this makes installation fail (sometimes?),
    # and nix store doesn't allow such fancy permission bits anyway.
    ''
      substituteInPlace Makefile.in --replace '$(INSTALL) -m 4711' '$(INSTALL) -m 0711'
    '';

  nativeBuildInputs = [ pkgconfig ];
  buildInputs = [ zlib openssl libedit pam ]
    ++ optional withKerberos kerberos
    ++ optional hpnSupport autoreconfHook;

  preConfigure = ''
    # Setting LD causes `configure' and `make' to disagree about which linker
    # to use: `configure' wants `gcc', but `make' wants `ld'.
    unset LD
  '';

  # I set --disable-strip because later we strip anyway. And it fails to strip
  # properly when cross building.
  configureFlags = [
    "--sbindir=\${out}/bin"
    "--localstatedir=/var"
    "--with-pid-dir=/run"
    "--with-mantype=man"
    "--with-libedit=yes"
    "--disable-strip"
    (if pam != null then "--with-pam" else "--without-pam")
  ] ++ optional (etcDir != null) "--sysconfdir=${etcDir}"
    ++ optional withKerberos "--with-kerberos5=${kerberos}"
    ++ optional stdenv.isDarwin "--disable-libutil"
    ++ optional (!linkOpenssl) "--without-openssl";

  enableParallelBuilding = true;

  hardeningEnable = [ "pie" ];

  postInstall = ''
    # Install ssh-copy-id, it's very useful.
    cp contrib/ssh-copy-id $out/bin/
    chmod +x $out/bin/ssh-copy-id
    cp contrib/ssh-copy-id.1 $out/share/man/man1/
  '';

  installTargets = [ "install-nokeys" ];
  installFlags = [
    "sysconfdir=\${out}/etc/ssh"
  ];

  meta = {
    homepage = http://www.openssh.com/;
    description = "An implementation of the SSH protocol";
    license = stdenv.lib.licenses.bsd2;
    platforms = platforms.unix;
    maintainers = with maintainers; [ eelco aneeshusa ];
  };
}