{stdenv, fetchurl, m4}:

assert m4 != null;

stdenv.mkDerivation {
  name = "bison-2.3";
  src = fetchurl {
    url = mirror://gnu/bison/bison-2.3.tar.bz2;
    md5 = "c18640c6ec31a169d351e3117ecce3ec";
  };
  buildNativeInputs = [m4];

  meta = {
    description = "GNU Bison, a Yacc-compatible parser generator";

    longDescription = ''
      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.
    '';

    homepage = http://www.gnu.org/software/bison/;

    license = "GPLv2+";
  };
 
  passthru = { glrSupport = true; };
}