gnu: Add Guile-XCB.

* gnu/packages/guile-wm.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu-system.am

@@ -90,6 +90,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/gstreamer.scm			\
   gnu/packages/gtk.scm				\
   gnu/packages/guile.scm			\
+  gnu/packages/guile-wm.scm			\
   gnu/packages/gv.scm				\
   gnu/packages/gvpe.scm				\
   gnu/packages/help2man.scm			\

gnu/packages/guile-wm.scm

@@ -0,0 +1,71 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages guile-wm)
+  #:use-module (guix licenses)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages xorg)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu))
+
+(define-public guile-xcb
+  (package
+    (name "guile-xcb")
+    (version "1.2")
+    (source (origin
+             (method url-fetch)
+             (uri (string-append "http://www.markwitmer.com/dist/guile-xcb-"
+                                 version ".tar.gz"))
+             (sha256
+              (base32
+               "009qrw46ay74z3mw8gz7jqvn90z9ilyhy00801w5vpyias02730y"))))
+    (build-system gnu-build-system)
+    (arguments '(;; Parallel builds fail.
+                 #:parallel-build? #f
+
+                 ;; The '.scm' files go to $(datadir), so set that to the
+                 ;; standard value.
+                 #:configure-flags (list (string-append
+                                          "--datadir="
+                                          (assoc-ref %outputs "out")
+                                          "/share/guile/site/2.0"))
+                 #:phases (alist-cons-before
+                           'configure 'set-go-directory
+                           (lambda* (#:key outputs #:allow-other-keys)
+                             ;; The makefile sets the .go directory to Guile's
+                             ;; own .go site directory, which is read-only.
+                             ;; Change it to point to $out/share/guile/site/2.0.
+                             (let ((out (assoc-ref outputs "out")))
+                               (substitute* "Makefile.in"
+                                 (("^godir = .*$")
+                                  (string-append "godir = " out
+                                                 "/share/guile/site/2.0\n")))))
+                           %standard-phases)))
+    (native-inputs `(("pkg-config" ,pkg-config)))
+    (inputs `(("guile" ,guile-2.0)
+              ("xcb" ,xcb-proto)))
+    (home-page "http://www.markwitmer.com/guile-xcb/guile-xcb.html")
+    (synopsis "XCB bindings for Guile")
+    (description
+     "Guile-XCB implements the XCB protocol and provides all the tools
+necessary to write X client code in Guile Scheme without any external
+dependencies.")
+    (license gpl3+)))