gnu: Add python-quex.

* gnu/packages/python.scm (python-quex): New variable.

gnu/packages/python.scm

@@ -13034,3 +13034,16 @@ filesystem events on Linux.")
     (synopsis "Lexical analyzer generator in Python")
     (description "@code{quex} is a lexical analyzer generator in Python.")
     (license license:lgpl2.1+)))        ; Non-military
+
+(define-public python2-quex
+  (package (inherit python2-quex-0.67.3)
+    (name "python2-quex")
+    (version "0.68.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "mirror://sourceforge/quex/DOWNLOAD/quex-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0svc9nla3b9145d6b7fb9dizx412l3difzqw0ilh9lz52nsixw8j"))
+       (file-name (string-append name "-" version ".tar.gz"))))))