gnu: Add GNU Mach headers.

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

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu-system.am

@@ -105,6 +105,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/gxmessage.scm			\
   gnu/packages/help2man.scm			\
   gnu/packages/hugs.scm				\
+  gnu/packages/hurd.scm				\
   gnu/packages/icu4c.scm			\
   gnu/packages/idutils.scm			\
   gnu/packages/imagemagick.scm			\

gnu/packages/hurd.scm

@@ -0,0 +1,57 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
+;;;
+;;; 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 hurd)
+  #:use-module (guix licenses)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu))
+
+(define-public gnumach-headers
+  (package
+    (name "gnumach-headers")
+    (version "1.4")
+    (source
+     (origin
+      (method url-fetch)
+      (uri (string-append "mirror://gnu/gnumach/gnumach-"
+                          version ".tar.gz"))
+      (sha256
+       (base32
+        "0r371wsm7imx356p0xsls5hifb1gf9y90rm1phr0qkahbmfk9hlv"))))
+    (build-system gnu-build-system)
+    (arguments
+    `(#:phases (alist-replace
+                'install
+                (lambda _
+                  (zero?
+                   (system* "make" "install-data")))
+                (alist-delete
+                 'build
+                 %standard-phases))
+
+      ;; GNU Mach supports only IA32 currently, so cheat so that we can at
+      ;; least install its headers.
+      #:configure-flags '("--build=i686-pc-gnu")
+
+      #:tests? #f))
+    (home-page "https://www.gnu.org/software/hurd/microkernel/mach/gnumach.html")
+    (synopsis "GNU Mach kernel headers")
+    (description
+     "Headers of the GNU Mach kernel.")
+    (license gpl2+)))