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diff --git a/guix/build-system/haskell.scm b/guix/build-system/haskell.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
+;;;
+;;; 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-system haskell)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix derivations)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
+  #:export (haskell-build
+            haskell-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for Haskell packages using 'Setup.hs'.  This is
+;; implemented as an extension of 'gnu-build-system'.
+;;
+;; Code:
+
+(define (default-haskell)
+  "Return the default Haskell package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((haskell (resolve-interface '(gnu packages haskell))))
+    (module-ref haskell 'ghc)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (haskell (default-haskell))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:target #:haskell #:inputs #:native-inputs))
+
+  (and (not target)                               ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("haskell" ,haskell)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build haskell-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (haskell-build store name inputs
+                        #:key source
+                        (haddock? #t)
+                        (haddock-flags ''())
+                        (tests? #t)
+                        (test-target "test")
+                        (configure-flags ''())
+                        (phases '(@ (guix build haskell-build-system)
+                                    %standard-phases))
+                        (outputs '("out"))
+                        (search-paths '())
+                        (system (%current-system))
+                        (guile #f)
+                        (imported-modules '((guix build haskell-build-system)
+                                            (guix build gnu-build-system)
+                                            (guix build utils)))
+                        (modules '((guix build haskell-build-system)
+                                   (guix build utils))))
+  "Build SOURCE using HASKELL, and with INPUTS.  This assumes that SOURCE
+provides a 'Setup.hs' file as its build system."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (haskell-build #:name ,name
+                      #:source ,(match (assoc-ref inputs "source")
+                                  (((? derivation? source))
+                                   (derivation->output-path source))
+                                  ((source)
+                                   source)
+                                  (source
+                                   source))
+                      #:configure-flags ,configure-flags
+                      #:haddock-flags ,haddock-flags
+                      #:system ,system
+                      #:test-target ,test-target
+                      #:tests? ,tests?
+                      #:haddock? ,haddock?
+                      #:phases ,phases
+                      #:outputs %outputs
+                      #:search-paths ',(map search-path-specification->sexp
+                                            search-paths)
+                      #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system #:graft? #f))
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages commencement)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system #:graft? #f)))))
+
+  (build-expression->derivation store name builder
+                                #:inputs inputs
+                                #:system system
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define haskell-build-system
+  (build-system
+    (name 'haskell)
+    (description "The standard Haskell build system")
+    (lower lower)))
+
+;;; haskell.scm ends here