anchor.diff:       mkdir -pv $out
        mv * $out
        rm $out/bin/*.{bat,dll,exe,sh}
  -     mv $out/README $out/docs
  +     mv $out/COPYING $out/LICENSE* $out/docs
   
        for i in $out/bin/*; do
          wrapProgram $i \
  
positive.code:      done
    '';
  
    meta = { 
      description = "Ruby interpreter written in Java";
      homepage = http://jruby.org/;
      license = "CPL-1.0 GPL-2 LGPL-2.1"; # one of those
  
negative.code: { stdenv, fetchurl, makeWrapper, jre }:
  
  stdenv.mkDerivation rec {
    name = "jruby-${version}";
  
    version = "1.7.12";
  
    src = fetchurl {
      url = "http://jruby.org.s3.amazonaws.com/downloads/${version}/jruby-bin-${version}.tar.gz";
      sha1 = "056cee1138e49da40a77f179b771372692479002";
    };
  
    buildInputs = [ makeWrapper ];
  