anchor.diff:  assert stdenv.system == "x86_64-linux" || stdenv.system == "i686-linux";
   
   let
  -  version = "1.7.3";
  +  version = "1.7.4";
     rake = buildRubyGem {
       inherit ruby;
       name = "rake-10.3.2";
  
positive.code:     if stdenv.system == "x86_64-linux" then
        fetchurl {
          url    = "https://dl.bintray.com/mitchellh/vagrant/vagrant_${version}_x86_64.deb";
          sha256 = "0zg2sdxgrmwqvzqw4z8d6ji8d0cby33nggv0n9ncjxp0wjiv8nkm";
        }
      else
        fetchurl {
          url    = "https://dl.bintray.com/mitchellh/vagrant/vagrant_${version}_i686.deb";
          sha256 = "0r23w49jwl3c3g4nns5xnrsrqyfkqsgln91cj30hxkw50d0ldpvs";
        };
  
    meta = with stdenv.lib; {
  
negative.code: 
    preFixup = ''
      # 'hide' the template file from shebang-patching
      chmod -x $out/opt/vagrant/embedded/gems/gems/bundler-1.10.5/lib/bundler/templates/Executable
      chmod -x $out/opt/vagrant/embedded/gems/gems/vagrant-${version}/plugins/provisioners/salt/bootstrap-salt.sh
    '';
  
    postFixup = ''
      chmod +x $out/opt/vagrant/embedded/gems/gems/bundler-1.10.5/lib/bundler/templates/Executable
      chmod +x $out/opt/vagrant/embedded/gems/gems/vagrant-${version}/plugins/provisioners/salt/bootstrap-salt.sh
    '';
  }
  