gnu: Add gnugo.

* gnu/packages/games.scm (gnugo): New variable.

gnu/packages/games.scm

@@ -8,6 +8,7 @@
 ;;; Copyright © 2014, 2015 Sou Bunnbu <iyzsong@gmail.com>
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2015 Andreas Enge <andreas@enge.fr>
+;;; Copyright © 2015 David Hashe <david.hashe@dhashe.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -834,3 +835,27 @@ straight into any libretro-compatible frontend.  RetroArch is the official
 reference frontend for the libretro API, currently used by most as a modular
 multi-system game/emulator system.")
     (license license:gpl3+)))
+
+(define-public gnugo
+  (package
+    (name "gnugo")
+    (version "3.8")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "mirror://gnu/gnugo/gnugo-" version
+                                 ".tar.gz"))
+             (sha256
+              (base32
+               "0wkahvqpzq6lzl5r49a4sd4p52frdmphnqsfdv7gdp24bykdfs6s"))))
+    (build-system gnu-build-system)
+    (inputs `(("readline" ,readline)))
+    (synopsis "Go game")
+    (description "GNU Go is a program that plays the game of Go, in which
+players place stones on a grid to form territory or capture other stones.
+While it can be played directly from the terminal, rendered in ASCII
+characters, it is also possible to play GNU Go with 3rd party graphical
+interfaces or even in Emacs.  It supports the standard game storage format
+(SGF, Smart Game Format) and inter-process communication format (GMP, Go
+Modem Protocol).")
+    (home-page "http://www.gnu.org/software/gnugo/")
+    (license license:gpl3+)))