link $out/bin/lex to $out/bin/flex and $out/lib/libl.a to $out/lib/libfl.a.

This is needed to make iputils build.

svn path=/nixpkgs/trunk/; revision=3264

pkgs/development/tools/parsing/flex/default.nix

@@ -4,6 +4,7 @@ assert yacc != null;
 
 stdenv.mkDerivation {
   name = "flex-2.5.4a";
+  builder = ./builder.sh;
   src = fetchurl {
     url = http://catamaran.labs.cs.uu.nl/dist/tarballs/flex-2.5.4a.tar.gz;
     md5 = "bd8753d0b22e1f4ec87a553a73021adf";