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diff --git a/guix/build/gx.scm b/guix/build/gx.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Pierre Neidhardt <mail@ambrevar.xyz>
+;;;
+;;; 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 (guix build gx)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 popen)
+  #:export (gx-fetch))
+
+;;; Commentary:
+;;;
+;;; This is the build-side support code of (guix gx-download).  It allows a
+;;; gx hash to be fetched.
+;;;
+;;; Code:
+
+(define* (gx-fetch hash directory
+                   #:key (gx-command "gx"))
+  "Fetch IPFS HASH into DIRECTORY.  HASH must be a valid IPFS hash.
+Return #t on success, #f otherwise."
+
+  (mkdir-p directory)
+
+  (with-directory-excursion directory
+    ;; TODO: Silence verbose output.
+
+    ;; Initialization is interactive, but we can shut it up by piping it to
+    ;; nothing.
+    (let ((port (open-pipe* OPEN_WRITE gx-command "init")))
+      (display "\n" port)
+      (if (not (eqv? 0 (status:exit-val (close-pipe port))))
+          (error "Cannot initialize gx package")))
+
+    ;; Fetch to the "vendor" directory.
+    (let ((port (open-pipe* OPEN_WRITE gx-command "import" "--local" hash)))
+      (display "N\n" port)
+      (if (not (eqv? 0 (status:exit-val (close-pipe port))))
+          (error "Cannot import gx package")))
+
+    (delete-file "package.json")
+    (mkdir-p   "gx/ipfs")
+    (rename-file (string-append  "vendor/gx/ipfs/" hash) (string-append "gx/ipfs/" hash))
+    (delete-file-recursively "vendor")
+    #t))
+
+;;; gx.scm ends here