xboard: import from homebrew/games.

Formula/xboard.rb

@@ -0,0 +1,45 @@
+class Xboard < Formula
+  desc "Graphical user interface for chess"
+  homepage "https://www.gnu.org/software/xboard/"
+  url "https://ftpmirror.gnu.org/xboard/xboard-4.9.1.tar.gz"
+  mirror "https://ftp.gnu.org/gnu/xboard/xboard-4.9.1.tar.gz"
+  sha256 "2b2e53e8428ad9b6e8dc8a55b3a5183381911a4dae2c0072fa96296bbb1970d6"
+  revision 1
+
+  bottle do
+    rebuild 1
+    sha256 "7004805cccc01a3e0d627c6781975e79a8659078059a11f12bd748bd0e281498" => :sierra
+    sha256 "6a41c3769384e668db117dd681ea1b40f5b3167ca39bca1b1df71fc655a60db4" => :el_capitan
+    sha256 "700ba70a1ba19ce440c9daf3132f43a655d20fa1e9c7da80066145024469f7f0" => :yosemite
+  end
+
+  head do
+    url "git://git.sv.gnu.org/xboard.git"
+    depends_on "autoconf" => :build
+    depends_on "automake" => :build
+  end
+
+  depends_on "pkg-config" => :build
+  depends_on "fairymax" => :recommended
+  depends_on "polyglot" => :recommended
+  depends_on "gettext"
+  depends_on "cairo"
+  depends_on "librsvg"
+  depends_on "gtk+"
+
+  def install
+    system "./autogen.sh" if build.head?
+    args = ["--prefix=#{prefix}",
+            "--with-gtk",
+            "--without-Xaw",
+            "--disable-zippy"]
+
+    system "./configure", *args
+    system "make"
+    system "make", "install"
+  end
+
+  test do
+    system bin/"xboard", "--help"
+  end
+end