tarsnap-gui: import from homebrew/gui.

Formula/tarsnap-gui.rb

@@ -0,0 +1,20 @@
+class TarsnapGui < Formula
+  desc "Cross platform GUI for the Tarsnap command-line client"
+  homepage "https://github.com/Tarsnap/tarsnap-gui/wiki"
+  url "https://github.com/Tarsnap/tarsnap-gui/archive/v0.9.tar.gz"
+  sha256 "e47e1e611f2c7bb5111bcc1d2d86fa2c045ba4af23f8430bbc3c72f546572cb8"
+  head "https://github.com/Tarsnap/tarsnap-gui.git"
+
+  depends_on "qt5"
+  depends_on "tarsnap"
+
+  def install
+    system "qmake"
+    system "make"
+    prefix.install "Tarsnap.app"
+  end
+
+  test do
+    system "#{opt_prefix}/Tarsnap.app/Contents/MacOS/Tarsnap", "--version"
+  end
+end