add formula for jack2

Formula/jack2.rb

+class Jack2 < Formula
+  desc "JACK low-latency audio server for multi-processor machines. It is a new implementation of the JACK server core features that aims in removing some limitations of the JACK1 design."
+  homepage "http://jackaudio.org/"
+  url "https://gitlab.zhdk.ch/TPF/jack2/repository/archive.zip?ref=v1.9.10-tpf"
+  version "1.9.11"
+  sha256 "cc0045e6e6681faee112e46ce1385ed85d8b00f87256a38b006c7b4b34109696"
+
+  depends_on "pkg-config" => :build
+  depends_on "python" => :build
+  depends_on "aften"
+  depends_on "berkeley-db"
+  depends_on "libsndfile"
+  depends_on "libsamplerate"
+  depends_on "readline"
+
+  conflicts_with "jack", :because => "jack2 is a replacement for jack"
+
+  def install
+    system "./waf", "configure",  "--prefix=#{prefix}"
+    system "./waf", "build"
+    system "./waf", "install"
+  end
+
+  plist_options :manual => "jackd -d coreaudio"
+
+  def plist; <<-EOS.undent
+    <?xml version="1.0" encoding="UTF-8"?>
+    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+    <plist version="1.0">
+    <dict>
+      <key>Label</key>
+      <string>#{plist_name}</string>
+      <key>WorkingDirectory</key>
+      <string>#{prefix}</string>
+      <key>ProgramArguments</key>
+      <array>
+        <string>#{opt_bin}/jackd</string>
+        <string>-d</string>
+        <string>coreaudio</string>
+      </array>
+      <key>RunAtLoad</key>
+      <true/>
+      <key>KeepAlive</key>
+      <true/>
+    </dict>
+    </plist>
+    EOS
+  end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/jackd --version")
+  end
+end