gnu: Add ristretto.

* gnu/packages/xfce.scm (ristretto): Add variable.

gnu/packages/xfce.scm

@@ -3,6 +3,7 @@
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2016 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2016 Florian Paul Schmidt <mista.tapas@gmx.net>
+;;; Copyright © 2016 Kei Yamashita <kei@openmailbox.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -756,3 +757,34 @@ (define-public xfce4-power-manager
 power level so that they can adjust their power consumption, and it provides the
 inhibit interface which allows applications to prevent automatic sleep.")
     (license gpl2+)))
+
+(define-public ristretto
+  (package
+    (name "ristretto")
+    (version "0.8.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://archive.xfce.org/src/apps/ristretto/"
+                                  (version-major+minor version) "/"
+                                  name "-" version ".tar.bz2"))
+              (sha256
+               (base32
+                "0a7kwhx51fd2kqh7l7kp13wcn39d2fjkwnn9rfd1k9ydrqj56qki"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("intltool" ,intltool)
+       ("pkg-config" ,pkg-config)))
+    (inputs
+     `(("desktop-file-utils" ,desktop-file-utils)
+       ("libexif" ,libexif)
+       ("libxfce4ui" ,libxfce4ui)
+       ("librsvg" ,librsvg)
+       ("tumbler" ,tumbler)))
+    (home-page "http://docs.xfce.org/apps/ristretto/start")
+    (synopsis "Fast and lightweight picture-viewer")
+    (description
+     "The Ristretto Image Viewer is an application that can be used to view,
+and scroll through images.  It can be used to run a slideshow of images, open
+images with other applications like an image-editor or configure an image as
+the desktop wallpaper.")
+    (license gpl2+)))