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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 flex)
+ #:use-module (guix licenses)
+ #:use-module (guix packages)
+ #:use-module (guix download)
+ #:use-module (guix build-system gnu)
+ #:use-module (distro)
+ #:use-module (gnu packages m4)
+ #:use-module (gnu packages bison)
+ #:use-module (gnu packages indent))
+
+(define-public flex
+ (package
+ (name "flex")
+ (version "2.5.37")
+ (source (origin
+ (method url-fetch)
+ (uri (string-append "mirror://sourceforge/flex/flex-"
+ version ".tar.bz2"))
+ (sha256
+ (base32
+ "0ah5mi4j62b85a9rllv1004mzjb5cd0mn4glvz13p88rpx77pahp"))))
+ (build-system gnu-build-system)
+ (arguments
+ '(#:patches (list (assoc-ref %build-inputs "patch/bison-tests"))))
+ (inputs `(("patch/bison-tests" ,(search-patch "flex-bison-tests.patch"))
+ ("bison" ,bison)
+ ("indent" ,indent)))
+ (propagated-inputs `(("m4" ,m4)))
+ (home-page "http://flex.sourceforge.net/")
+ (synopsis "A fast lexical analyser generator")
+ (description
+ "Flex is a tool for generating scanners. A scanner, sometimes
+called a tokenizer, is a program which recognizes lexical patterns in
+text. The flex program reads user-specified input files, or its standard
+input if no file names are given, for a description of a scanner to
+generate. The description is in the form of pairs of regular expressions
+and C code, called rules. Flex generates a C source file named,
+\"lex.yy.c\", which defines the function yylex(). The file \"lex.yy.c\"
+can be compiled and linked to produce an executable. When the executable
+is run, it analyzes its input for occurrences of text matching the
+regular expressions for each rule. Whenever it finds a match, it
+executes the corresponding C code.")
+ (license (bsd-style "file://COPYING"
+ "See COPYING in the distribution."))))
+