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diff --git a/etc/release-manifest.scm b/etc/release-manifest.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 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/>.
+
+;;; This file returns a manifest containing release-critical bit, for all the
+;;; supported architectures and cross-compilation targets.
+
+(use-modules (gnu packages)
+             (guix packages)
+             (guix profiles)
+             ((gnu ci) #:select (%cross-targets))
+             (srfi srfi-1)
+             (srfi srfi-26))
+
+(define* (package->manifest-entry* package system
+                                   #:key target)
+  "Return a manifest entry for PACKAGE on SYSTEM, optionally cross-compiled to
+TARGET."
+  (manifest-entry
+    (inherit (package->manifest-entry package))
+    (name (string-append (package-name package) "." system
+                         (if target
+                             (string-append "." target)
+                             "'")))
+    (item (with-parameters ((%current-system system)
+                            (%current-target-system target))
+            package))))
+
+(define %base-packages
+  ;; Packages that must be substitutable on all the platforms Guix supports.
+  (map specification->package
+       '("bootstrap-tarballs" "gcc-toolchain" "nss-certs"
+         "openssh" "emacs" "vim" "python" "guile" "guix")))
+
+(define %system-packages
+  ;; Key packages proposed by the Guix System installer.
+  (map specification->package
+       '("xorg-server" "xfce" "gnome" "mate" "enlightenment"
+         "openbox" "awesome" "i3-wm" "ratpoison"
+         "xlockmore" "slock" "libreoffice"
+         "connman" "network-manager" "network-manager-applet"
+         "openssh" "ntp" "tor"
+         "linux-libre" "grub-hybrid"
+         ;; FIXME: Add IceCat when Rust is available on i686.
+         ;;"icecat"
+         )))
+
+(define %packages-to-cross-build
+  ;; Packages that must be cross-buildable from x86_64-linux.
+  (cons (@ (gnu packages gcc) gcc)
+        (map specification->package
+             '("coreutils" "grep" "sed" "findutils" "diffutils" "patch"
+               "gawk" "gettext" "gzip" "xz"
+               "hello" "guile@2.2" "zlib"))))
+
+(define %cross-bootstrap-targets
+  ;; Cross-compilation triplets for which 'bootstrap-tarballs' must be
+  ;; buildable.
+  '("i586-pc-gnu"
+    "arm-linux-gnueabihf"
+    "aarch64-linux-gnu"))
+
+
+;;;
+;;; Manifests.
+;;;
+
+(define %base-manifest
+  (manifest
+   (append-map (lambda (system)
+                 (map (cut package->manifest-entry* <> system)
+                      %base-packages))
+               %hydra-supported-systems)))
+
+(define %cross-manifest
+  (manifest
+   (append-map (lambda (target)
+                 (map (cut package->manifest-entry* <> "x86_64-linux"
+                           #:target target)
+                      %packages-to-cross-build))
+               %cross-targets)))
+
+(define %cross-bootstrap-manifest
+  (manifest
+   (map (lambda (target)
+          (package->manifest-entry*
+           (specification->package "bootstrap-tarballs")
+           "x86_64-linux" #:target target))
+        %cross-bootstrap-targets)))
+
+;; Return the union of all three manifests.
+(concatenate-manifests (list %base-manifest
+                             %cross-manifest
+                             %cross-bootstrap-manifest))