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diff --git a/guix/build/ocaml-build-system.scm b/guix/build/ocaml-build-system.scm
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+++ b/guix/build/ocaml-build-system.scm
@@ -0,0 +1,119 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016, 2017 Julien Lepiller <julien@lepiller.eu>
+;;;
+;;; 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 ocaml-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:export (%standard-phases
+            ocaml-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard ocaml build procedure.
+;;
+;; Code:
+
+(define* (ocaml-findlib-environment #:key outputs #:allow-other-keys)
+  (let* ((out (assoc-ref outputs "out")))
+    (setenv "OCAMLFIND_DESTDIR" (string-append out "/lib/ocaml/site-lib"))
+    (setenv "OCAMLFIND_LDCONF" "ignore"))
+  #t)
+
+(define* (configure #:key outputs (configure-flags '())
+                    (test-flags '("--enable-tests")) tests?
+                    #:allow-other-keys)
+  "Configure the given package."
+  (let* ((out        (assoc-ref outputs "out")))
+    (format #t "build directory: ~s~%" (getcwd))
+    (if (file-exists? "setup.ml")
+      (let ((args `("-configure"
+                    "--prefix" ,out
+                    ,@(if tests?
+                          test-flags
+                          '())
+                    ,@configure-flags)))
+        (format #t "running 'setup.ml' with arguments ~s~%" args)
+        (zero? (apply system* "ocaml" "setup.ml" args)))
+       (let ((args `("-prefix" ,out ,@configure-flags)))
+        (format #t "running 'configure' with arguments ~s~%" args)
+        (zero? (apply system* "./configure" args))))))
+
+(define* (build #:key inputs outputs (build-flags '()) (make-flags '())
+                (use-make? #f) #:allow-other-keys)
+  "Build the given package."
+  (if (and (file-exists? "setup.ml") (not use-make?))
+    (zero? (apply system* "ocaml" "setup.ml" "-build" build-flags))
+    (if (file-exists? "Makefile")
+      (zero? (apply system* "make" make-flags))
+      (let ((file (if (file-exists? "pkg/pkg.ml") "pkg/pkg.ml" "pkg/build.ml")))
+        (zero? (apply system* "ocaml" "-I"
+                              (string-append (assoc-ref inputs "findlib")
+                                             "/lib/ocaml/site-lib")
+                              file build-flags))))))
+
+(define* (check #:key inputs outputs (make-flags '()) (test-target "test") tests?
+                  (use-make? #f) #:allow-other-keys)
+  "Install the given package."
+  (when tests?
+    (if (and (file-exists? "setup.ml") (not use-make?))
+      (zero? (system* "ocaml" "setup.ml" (string-append "-" test-target)))
+      (if (file-exists? "Makefile")
+        (zero? (apply system* "make" test-target make-flags))
+        (let ((file (if (file-exists? "pkg/pkg.ml") "pkg/pkg.ml" "pkg/build.ml")))
+          (zero? (system* "ocaml" "-I"
+                          (string-append (assoc-ref inputs "findlib")
+                                         "/lib/ocaml/site-lib")
+                          file test-target)))))))
+
+(define* (install #:key outputs (build-flags '()) (make-flags '()) (use-make? #f)
+                  (install-target "install")
+                  #:allow-other-keys)
+  "Install the given package."
+  (let ((out (assoc-ref outputs "out")))
+    (if (and (file-exists? "setup.ml") (not use-make?))
+      (zero? (apply system* "ocaml" "setup.ml"
+                    (string-append "-" install-target) build-flags))
+      (if (file-exists? "Makefile")
+        (zero? (apply system* "make" install-target make-flags))
+        (zero? (system* "opam-installer" "-i" (string-append "--prefix=" out)
+                        (string-append "--libdir=" out "/lib/ocaml/site-lib")))))))
+
+(define* (prepare-install #:key outputs #:allow-other-keys)
+  "Prepare for building the given package."
+  (mkdir-p (string-append (assoc-ref outputs "out") "/lib/ocaml/site-lib"))
+  (mkdir-p (string-append (assoc-ref outputs "out") "/bin")))
+
+(define %standard-phases
+  ;; Everything is as with the GNU Build System except for the `configure'
+  ;; , `build', `check' and `install' phases.
+  (modify-phases gnu:%standard-phases
+    (add-before 'configure 'ocaml-findlib-environment
+                ocaml-findlib-environment)
+    (add-before 'install 'prepare-install prepare-install)
+    (replace 'configure configure)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)))
+
+(define* (ocaml-build #:key inputs (phases %standard-phases)
+                      #:allow-other-keys #:rest args)
+  "Build the given package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; ocaml-build-system.scm ends here