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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2016 Pjotr Prins <pjotr.public12@thebird.nl>
+;;; 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 (gnu packages elixir)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages erlang)
+  #:use-module (gnu packages version-control))
+
+(define-public elixir
+  (package
+    (name "elixir")
+    (version "1.3.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://github.com/elixir-lang/elixir"
+                                  "/archive/v" version ".tar.gz"))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0jsc6kl7f74yszcypdv3w3vhyc9qfqav8nwc41in082m0vpfy95y"))
+              ;; FIXME: Some tests had to be disabled as they fail in the
+              ;; build environment.  Common failures are:
+              ;; - Mix.Shell.cmd() fails with error 130
+              ;; - The git_repo fixture cannot be found
+              ;; - Communication with spawned processes fails with EPIPE
+              ;; - Failure to copy files
+              (patches (search-patches "elixir-disable-failing-tests.patch"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:test-target "test"
+       #:make-flags (list (string-append "PREFIX="
+                                         (assoc-ref %outputs "out")))
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'replace-paths
+           (lambda* (#:key inputs #:allow-other-keys)
+             (substitute* '("lib/elixir/lib/system.ex"
+                            "lib/mix/lib/mix/scm/git.ex")
+               (("(cmd\\(['\"])git" _ prefix)
+                (string-append prefix (which "git"))))
+             (substitute* "bin/elixir"
+               (("ERL_EXEC=\"erl\"")
+                (string-append "ERL_EXEC=" (which "erl"))))
+             #t))
+         (add-after 'unpack 'fix-or-disable-tests
+           (lambda* (#:key inputs #:allow-other-keys)
+             ;; Some tests require access to a home directory.
+             (setenv "HOME" "/tmp")
+
+             ;; FIXME: These tests fail because the "git_repo" fixture does
+             ;; not exist or cannot be found.
+             (delete-file "lib/mix/test/mix/tasks/deps.git_test.exs")
+
+             ;; FIXME: Mix.Shell.cmd() always fails with error code 130.
+             (delete-file "lib/mix/test/mix/shell_test.exs")
+             #t))
+         (add-before 'build 'make-current
+           ;; The Elixir compiler checks whether or not to compile files by
+           ;; inspecting their timestamps.  When the timestamp is equal to the
+           ;; epoch no compilation will be performed.  Some tests fail when
+           ;; files are older than Jan 1, 2000.
+           (lambda _
+             (for-each (lambda (file)
+                         (let ((recent 1400000000))
+                           (utime file recent recent 0 0)))
+                       (find-files "." ".*"))
+             #t))
+         (delete 'configure))))
+    (inputs
+     `(("erlang" ,erlang)
+       ("git" ,git)))
+    (home-page "http://elixir-lang.org/")
+    (synopsis "Elixir programming language")
+    (description "Elixir is a dynamic, functional language used to build
+scalable and maintainable applications.  Elixir leverages the Erlang VM, known
+for running low-latency, distributed and fault-tolerant systems, while also
+being successfully used in web development and the embedded software domain.")
+    (license license:asl2.0)))