gnu: Add emacs-4clojure.

* gnu/packages/emacs-xyz.scm (emacs-4clojure): New variable.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu/packages/emacs-xyz.scm

@@ -5381,7 +5381,30 @@ orange and red as accent colors.")
      "This program is an implementation of 2048 for Emacs.
 The goal of this game is to create a tile with value 2048.  The size of the
 board and goal value can be customized.")
-  (license license:gpl3+)))
+    (license license:gpl3+)))
+
+(define-public emacs-4clojure
+  (package
+    (name "emacs-4clojure")
+    (version "0.2.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/emacsorphanage/4clojure.git")
+             (commit "4eccf8c7d4341a36c269451838114b27836699f9")))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "19x653lzc1dxil4ix257hciidbdmbhaxhs6qhlkwi9ygjrlrgvnk"))))
+    (build-system emacs-build-system)
+    (propagated-inputs
+     `(("emacs-request" ,emacs-request)))
+    (home-page "https://github.com/emacsorphanage/4clojure/")
+    (synopsis "Open and evaluate 4clojure questions in Emacs")
+    (description "Emacs 4clojure interacts with @url{http://www4clojure.com,
+4clojure} problems.  You can open a specific question and move to the next or
+previous one.  You can also verify you answers.")
+    (license license:gpl3)))
 
 (define-public emacs-base16-theme
   (package