diff --git a/Formula/erlang@17.rb b/Formula/erlang@17.rb
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@@ -0,0 +1,102 @@
+class ErlangAT17 < Formula
+  desc "Programming language for highly scalable real-time systems"
+  homepage "https://www.erlang.org/"
+  url "https://github.com/erlang/otp/archive/OTP-17.5.6.9.tar.gz"
+  sha256 "387c612d1bc5ffbc68db7d05c3655804b310facc8bad921a3e0f3391970bc522"
+  head "https://github.com/erlang/otp.git", :branch => "maint-17"
+
+  keg_only :versioned_formula
+
+  option "without-hipe", "Disable building hipe; fails on various macOS systems"
+  option "with-native-libs", "Enable native library compilation"
+  option "with-dirty-schedulers", "Enable experimental dirty schedulers"
+  option "without-docs", "Do not install documentation"
+
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
+  depends_on "openssl"
+  depends_on "unixodbc" if MacOS.version >= :mavericks
+  depends_on "fop" => :optional # enables building PDF docs
+  depends_on "wxmac" => :recommended # for GUI apps like observer
+
+  # Erlang will crash on macOS 10.13 any time the crypto lib is used.
+  # The Erlang team has an open PR for the patch but it needs to be applied to
+  # older releases. See https://github.com/erlang/otp/pull/1501 and
+  # https://bugs.erlang.org/browse/ERL-439 for additional information.
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/formula-patches/8cf3045/erlang%4017/boring-ssl-high-sierra.patch"
+    sha256 "ec4bbdabdfece3a273210727bc150e0e588479885a141382b4d54221bbec5fc3"
+  end
+
+  resource "man" do
+    url "https://www.erlang.org/download/otp_doc_man_17.5.tar.gz"
+    sha256 "85b1b2a1011fc01af550f1fe9e5a599a4c5f2a35d264d2804af1d05590a857c3"
+  end
+
+  resource "html" do
+    url "https://www.erlang.org/download/otp_doc_html_17.5.tar.gz"
+    sha256 "baba1d373c1faacf4a1a6ec1220d57d0cb2b977edb74f32cd58dc786361c6cf5"
+  end
+
+  def install
+    # Unset these so that building wx, kernel, compiler and
+    # other modules doesn't fail with an unintelligable error.
+    %w[LIBS FLAGS AFLAGS ZFLAGS].each { |k| ENV.delete("ERL_#{k}") }
+
+    ENV["FOP"] = "#{HOMEBREW_PREFIX}/bin/fop" if build.with? "fop"
+
+    # Do this if building from a checkout to generate configure
+    system "./otp_build", "autoconf" if File.exist? "otp_build"
+
+    args = %W[
+      --disable-debug
+      --disable-silent-rules
+      --prefix=#{prefix}
+      --enable-kernel-poll
+      --enable-threads
+      --enable-sctp
+      --enable-dynamic-ssl-lib
+      --with-ssl=#{Formula["openssl"].opt_prefix}
+      --enable-shared-zlib
+      --enable-smp-support
+    ]
+
+    args << "--enable-darwin-64bit" if MacOS.prefer_64_bit?
+    args << "--enable-native-libs" if build.with? "native-libs"
+    args << "--enable-dirty-schedulers" if build.with? "dirty-schedulers"
+    args << "--enable-wx" if build.with? "wxmac"
+    args << "--with-dynamic-trace=dtrace" if MacOS::CLT.installed?
+
+    if build.without? "hipe"
+      # HIPE doesn't strike me as that reliable on macOS
+      # https://syntatic.wordpress.com/2008/06/12/macports-erlang-bus-error-due-to-mac-os-x-1053-update/
+      # https://www.erlang.org/pipermail/erlang-patches/2008-September/000293.html
+      args << "--disable-hipe"
+    else
+      args << "--enable-hipe"
+    end
+
+    system "./configure", *args
+    system "make"
+    ENV.deparallelize # Install is not thread-safe; can try to create folder twice and fail
+    system "make", "install"
+
+    if build.with? "docs"
+      (lib/"erlang").install resource("man").files("man")
+      doc.install resource("html")
+    end
+  end
+
+  def caveats; <<-EOS.undent
+    Man pages can be found in:
+      #{opt_lib}/erlang/man
+
+    Access them with `erl -man`, or add this directory to MANPATH.
+    EOS
+  end
+
+  test do
+    system "#{bin}/erl", "-noshell", "-eval", "crypto:start().", "-s", "init", "stop"
+  end
+end