gnu: Add ghc-xmonad-contrib.

* gnu/packages/wm.scm (ghc-xmonad-contrib): New variable.

Signed-off-by: Eric Bavier <bavier@member.fsf.org>

gnu/packages/wm.scm

@@ -194,3 +194,31 @@ (define-public xmonad
 used on each workspace.  Xinerama is fully supported, allowing windows to be
 tiled on several screens.")
     (license bsd-3)))
+
+(define-public ghc-xmonad-contrib
+  (package
+    (name "ghc-xmonad-contrib")
+    (version "0.11.3")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "http://hackage.haskell.org/package/xmonad-contrib/"
+                           "xmonad-contrib-" version ".tar.gz"))
+       (sha256
+        (base32
+         "14h9vr33yljymswj50wbimav263y9abdcgi07mvfis0zd08rxqxa"))))
+    (build-system haskell-build-system)
+    (propagated-inputs
+     `(("ghc-mtl" ,ghc-mtl)
+       ("ghc-random" ,ghc-random)
+       ("ghc-utf8-string" ,ghc-utf8-string)
+       ("ghc-extensible-exceptions" ,ghc-extensible-exceptions)
+       ("ghc-x11" ,ghc-x11)
+       ("ghc-x11-xft" ,ghc-x11-xft)
+       ("xmonad" ,xmonad)))
+    (home-page "http://xmonad.org")
+    (synopsis "Third party extensions for xmonad")
+    (description
+     "Third party tiling algorithms, configurations, and scripts to Xmonad, a
+tiling window manager for X.")
+    (license bsd-3)))