Hello,
I'm helping Manolis forward some pending patches.
Attach the patch with suggested corrections.

Make sure the phase returns #t on success:

  (and (zero? (system* "make" …))
       (begin
         (copy-file …)
         #t))


+    (synopsis "Microkernel of the GNU system")
+    (description
+ "GNU Mach is the microkernel upon which a GNU Hurd system is based.")
+    (license gpl2+)))

Does it build both on GNU/Linux and GNU/Hurd?

For GNU/Linux (core-updates) works, also works in Hurd.
From 2128b50a0dda9e4e6dbad74f2706aee58f81708d Mon Sep 17 00:00:00 2001
From: rennes <ren...@openmailbox.org>
Date: Thu, 16 Mar 2017 09:29:55 -0600
Subject: [PATCH 2/2] gnu: Add GNU Mach.

* gnu/packages/hurd.scm (gnumach): New variable.

Co-authored-by: Rene Saavedra <ren...@openmailbox.org>
---
 gnu/packages/hurd.scm | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/hurd.scm b/gnu/packages/hurd.scm
index ba91b60be..66608f2d8 100644
--- a/gnu/packages/hurd.scm
+++ b/gnu/packages/hurd.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016 Manolis Fragkiskos Ragkousis <manolis...@gmail.com>
+;;; Copyright © 2014, 2015, 2016, 2017 Manolis Fragkiskos Ragkousis <manolis...@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -210,3 +210,37 @@ Library for GNU/Hurd.")
 Hurd-minimal package which are needed for both glibc and GCC.")
     (home-page (package-home-page hurd-headers))
     (license (package-license hurd-headers))))
+
+(define-public gnumach
+  (package
+    (name "gnumach")
+    (version "1.8")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (gnumach-source-url version))
+       (sha256
+        (base32
+         "02hygsfpd2dljl5lg1vjjg9pizi9jyxd4aiiqzjshz6jax62jm9f"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:phases (modify-phases %standard-phases
+                  (add-after 'install 'produce-image
+                             (lambda* (#:key outputs #:allow-other-keys)
+                               (let* ((out  (assoc-ref outputs "out"))
+                                      (boot (string-append out "/boot")))
+                                 (and (zero? (system* "make" "gnumach.gz"))
+                                      (begin
+                                        (copy-file "gnumach.gz"
+                                                   (string-append boot "/gnumach.gz"))
+                                        #t))))))))
+    (native-inputs
+     `(("mig" ,mig)
+       ("perl" ,perl)))
+    (supported-systems %hurd-systems)
+    (home-page
+     "https://www.gnu.org/software/hurd/microkernel/mach/gnumach.html";)
+    (synopsis "Microkernel of the GNU system")
+    (description
+      "GNU Mach is the microkernel upon which a GNU Hurd system is based.")
+    (license gpl2+)))
-- 
2.12.0

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