gnu: Add dosbox x86 emulator.

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

gnu/packages/games.scm

@@ -12,6 +12,7 @@
 ;;; Copyright © 2015 Christopher Allan Webber <cwebber@dustycloud.org>
 ;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2015 Alex Kost <alezost@gmail.com>
+;;; Copyright © 2015 Paul van der Walt <paul@denknerd.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -34,7 +35,9 @@
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix git-download)
+  #:use-module (guix svn-download)
   #:use-module (gnu packages)
+  #:use-module (gnu packages autotools)
   #:use-module (gnu packages base)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages audio)
@@ -1048,6 +1051,47 @@ experience and advance levels, and are carried over from one scenario to the
 next campaign.")
     (license license:gpl2+)))
 
+(define-public dosbox
+  (package
+    (name "dosbox")
+    (version "0.74.svn3947")
+    (source (origin
+              (method svn-fetch)
+              (uri (svn-reference
+                    (url "http://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk/")
+                    (revision 3947)))
+              ;; Use SVN head, since the last release (2010) is incompatible
+              ;; with GCC 4.8+ (see
+              ;; <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=624976>).
+              (sha256
+               (base32
+                "1p918j6090d1nkvgq7ifvmn506zrdmyi32y7p3ms40d5ssqjg8fj"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:phases (modify-phases %standard-phases
+                  (add-before
+                   'configure 'autogen.sh
+                   (lambda _
+                     (zero? (system* "sh" "autogen.sh")))))))
+    (native-inputs
+     `(("autoconf" ,autoconf)
+       ("automake" ,automake)))
+    (inputs
+     `(("sdl" ,sdl)
+       ("libpng" ,libpng)
+       ("zlib" ,zlib)
+       ("alsa-lib" ,alsa-lib)
+       ("glu" ,glu)
+       ("mesa" ,mesa)))
+    (home-page "http://www.dosbox.com")
+    (synopsis "x86 emulator with CGA/EGA/VGA/etc. graphics and sound")
+    (description "DOSBox is a DOS-emulator that uses the SDL library.  DOSBox
+also emulates CPU:286/386 realmode/protected mode, Directory
+FileSystem/XMS/EMS, Tandy/Hercules/CGA/EGA/VGA/VESA graphics, a
+SoundBlaster/Gravis Ultra Sound card for excellent sound compatibility with
+older games.")
+    (license license:gpl2+)))
+
 (define-public gamine
   (package
     (name "gamine")