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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2012 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 bison)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages m4)
+  #:use-module (gnu packages perl))
+
+(define-public bison
+  (package
+    (name "bison")
+    (version "2.6.1")
+    (source
+     (origin
+      (method url-fetch)
+      (uri (string-append "mirror://gnu/bison/bison-"
+                          version ".tar.xz"))
+      (sha256
+       (base32
+        "0y9svfkbw8jc8yv280hqzilpvlwg60gayck83jj98djmzaxr1w86"))))
+    (build-system gnu-build-system)
+    (inputs `(("perl" ,perl)))
+    (propagated-inputs `(("m4" ,m4)))
+    (home-page "http://www.gnu.org/software/bison/")
+    (synopsis
+     "GNU Bison, a Yacc-compatible parser generator")
+    (description
+     "Bison is a general-purpose parser generator that converts an
+annotated context-free grammar into an LALR(1) or GLR parser for
+that grammar.  Once you are proficient with Bison, you can use
+it to develop a wide range of language parsers, from those used
+in simple desk calculators to complex programming languages.
+
+Bison is upward compatible with Yacc: all properly-written Yacc
+grammars ought to work with Bison with no change.  Anyone
+familiar with Yacc should be able to use Bison with little
+trouble.  You need to be fluent in C or C++ programming in order
+to use Bison.")
+    (license gpl3+)))