gnu: Add xfce4-session.

* gnu/packages/xfce.scm (xfce4-session): New variable.

gnu/packages/xfce.scm

@@ -290,3 +290,34 @@ (define-public xfce4-appfinder
      "Application finder for Xfce, it will show the applications installed on
 your system in categories, so you can quickly find and launch them.")
     (license gpl2+)))
+
+(define-public xfce4-session
+  (package
+    (name "xfce4-session")
+    (version "4.10.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://archive.xfce.org/xfce/"
+                                  (version-major+minor version)
+                                  "/src/" name "-" version ".tar.bz2"))
+              (sha256
+               (base32
+                "1kj65jkjhd0ysf0yxsf88wzpyv6n8i8qgd3gb502hf1x9jksk2mv"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:configure-flags
+       (list (string-append "--with-xsession-prefix=" %output))))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)
+       ("intltool" ,intltool)))
+    (inputs
+     `(("iceauth" ,iceauth)
+       ("libsm" ,libsm)
+       ("libwnck" ,libwnck-1)
+       ("libxfce4ui" ,libxfce4ui)))
+    (home-page "http://www.xfce.org/")
+    (synopsis "Xfce session manager")
+    (description
+     "Session manager for Xfce, it will restore your session on startup and
+allows you to shutdown the computer from Xfce.")
+    (license gpl2+)))