Rakefile

require 'bundler'
Bundler::GemHelper.install_tasks

# rspec
begin
  require 'rspec'
  require 'rspec/core/rake_task'

  desc "Run all examples with RCov"
  RSpec::Core::RakeTask.new('spec:rcov') do |t|
    t.rcov = true
  end
  RSpec::Core::RakeTask.new('spec') do |t|
    t.verbose = true
  end

  task :default => :spec
rescue LoadError
  puts "rspec, or one of its dependencies, is not available. Install it with: sudo gem install rspec"
end

# rake-compiler
require 'rake' unless defined? Rake

gem 'rake-compiler', '>= 0.7.5'
require "rake/extensiontask"

Rake::ExtensionTask.new('bzip2') do |ext|
  ext.cross_compile = true
  ext.cross_platform = ['x86-mingw32', 'x86-mswin32-60']

  ext.lib_dir = File.join 'lib', 'bzip2'
end

Rake::Task[:spec].prerequisites << :compile