Strange autoparts package errors

vlc.rb

# Copyright (c) 2013-2014 Irrational Industries Inc. d.b.a. Nitrous.IO
# This software is licensed under the [BSD 2-Clause license](https://raw.github.com/nitrous-io/autoparts/master/LICENSE).

module Autoparts
  module Packages
    class Vlc < Package
      name 'vlc'
      version '2.1.4'
      description 'A free and open source multimedia player and framework'
      category Category::UTILITIES

      source_url 'http://download.videolan.org/pub/videolan/vlc/2.1.4/vlc-2.1.4.tar.xz'
      source_sha1 '53896c88947803193a21fb4619f34034bad05920'
      source_filetype 'tar.xz'

      def compile
        Dir.chdir(name_with_version) do
        end
      end

      def install
        Dir.chdir(name_with_version) do
        end
      end
    end
  end
end

What happens.sh

$ parts install zsh
=> Extracting archive...                                                                                                                                                                                                 
=> Installing...                                                                                                                                                                                                         
=> Activating...                                                                                                                                                                                                         
=> Installed zsh 5.0.5

$ parts install vlc
=> Extracting archive...                                                                                                                                                                                                 
=> Compiling...                                                                                                                                                                                                          
parts: ERROR: No such file or directory @ dir_chdir - vlc-2.1.4                                                                                                                                                          
Aborting!

zsh.rb

# Copyright (c) 2013-2014 Irrational Industries Inc. d.b.a. Nitrous.IO
# This software is licensed under the [BSD 2-Clause license](https://raw.github.com/nitrous-io/autoparts/master/LICENSE).

module Autoparts
  module Packages
    class Zsh < Package
      name 'zsh'
      version '5.0.5'
      description 'Zsh: A shell with lots of features'
      category Category::SHELLS

      source_url 'https://downloads.sourceforge.net/project/zsh/zsh/5.0.5/zsh-5.0.5.tar.bz2'
      source_sha1 '75426146bce45ee176d9d50b32f1ced78418ae16'
      source_filetype 'tar.gz'

      def compile
        Dir.chdir(name_with_version) do
        end
      end

      def install
        Dir.chdir(name_with_version) do
        end
      end
    end
  end
end

I've opened a pull request for .tar.xz support for autoparts ;)