* Some Bison/Flex refactoring.

* Added Bison 2.3.

svn path=/nixpkgs/trunk/; revision=6635

pkgs/development/tools/parsing/bison/bison-2.1.nix

@@ -1,14 +0,0 @@
-{stdenv, fetchurl, m4}:
-
-assert m4 != null;
-
-stdenv.mkDerivation {
-  name = "bison-2.1";
-  src = fetchurl {
-    url = http://nix.cs.uu.nl/dist/tarballs/bison-2.1.tar.bz2;
-    md5 = "ef3110077462b1140b2ae612626e8486";
-  };
-  buildInputs = [m4];
-} // {
-  glrSupport = true;
-}