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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; 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 robotics)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix git-download)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system cmake)
+  #:use-module (gnu packages gl)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages qt)
+  #:use-module (gnu packages sdl))
+
+(define-public enki
+  ;; Previous versions use Qt4 and are unsuitable for Aseba.
+  (let ((commit "afd2d8e2f91c095f6745505ca1f32f31ea874200")
+        (revision "0"))
+    (package
+      (name "enki")
+      (version (git-version "2.0pre" revision commit))
+      (home-page "https://github.com/enki-community/enki/")
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference (url home-page) (commit commit)))
+                (sha256
+                 (base32
+                  "1d1901zzsfml97hb4mb3ah3ab1bk4kh7bn6m7xrj1rv0gk9wkhq7"))
+                (file-name (string-append name "-" version "-checkout"))))
+      (build-system cmake-build-system)
+      (arguments
+       '(#:configure-flags '("-DBUILD_SHARED_LIBS=ON")))
+      (native-inputs `(("pkg-config" ,pkg-config)))
+      (inputs
+       ;; Optionally, add Python + Boost for Python bindings.
+       `(("sdl2" ,sdl2)))
+      (propagated-inputs
+       ;; 'Viewer.h' includes 'QGLWidget'.
+       `(("qtbase" ,qtbase)                ;the viewer module needs Qt5 + MESA
+         ("mesa" ,mesa)))
+      (synopsis "Robot simulator")
+      (description
+       "Enki is a robot simulator written in C++.  It provides collision and
+limited physics support for robots evolving on a flat surface.  On a
+contemporary desktop computer, Enki is able to simulate groups of robots
+hundred times faster than real-time.")
+
+      ;; The 'LICENSE' file as well as source file headers says that
+      ;; researchers using the software are "asked" to cite using a given
+      ;; citation, but that sentence is written as not being part of the
+      ;; license (fortunately).
+      (license license:gpl2+))))