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diff --git a/guix/build/minify-build-system.scm b/guix/build/minify-build-system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; 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 minify-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module ((guix build minify-build-system) #:prefix minify:)
+  #:use-module (guix build utils)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 popen)
+  #:export (%standard-phases
+            minify-build
+            minify))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard minification procedure for JavaScript
+;; files.
+;;
+;; Code:
+
+(define* (minify file #:key target (directory ""))
+  (format #t "minifying ~a\n" file)
+  (let* ((base (basename file ".js"))
+         (installed (or target (string-append directory base ".min.js")))
+         (minified (open-pipe* OPEN_READ "uglify-js" file)))
+    (call-with-output-file installed
+      (cut dump-port minified <>))
+    #t))
+
+(define* (build #:key javascript-files
+                #:allow-other-keys)
+  (let ((files (or javascript-files
+                   (find-files "src" "\\.js$"))))
+    (mkdir-p "guix/build")
+    (every (cut minify <> #:directory "guix/build/") files)))
+
+(define* (install #:key outputs #:allow-other-keys)
+  (let* ((out (assoc-ref outputs "out"))
+         (js  (string-append out "/share/javascript/")))
+    (mkdir-p js)
+    (for-each (cut install-file <> js)
+              (find-files "guix/build" "\\.min\\.js$")))
+  #t)
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (delete 'configure)
+    (replace 'build build)
+    (delete 'check)
+    (replace 'install install)))
+
+(define* (minify-build #:key inputs (phases %standard-phases)
+                       #:allow-other-keys #:rest args)
+  "Build the given JavaScript package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; minify-build-system.scm ends here