class Bundler::RubygemsIntegration

def backport_ext_builder_monitor 

def backport_ext_builder_monitor
  # So we can avoid requiring "rubygems/ext" in its entirety
  Gem.module_eval <<-RUBY, __FILE__, __LINE__ + 1
    module Ext
    end
  RUBY
  require "rubygems/ext/builder"
  Gem::Ext::Builder.class_eval do
    unless const_defined?(:CHDIR_MONITOR)
      const_set(:CHDIR_MONITOR, EXT_LOCK)
    end
    remove_const(:CHDIR_MUTEX) if const_defined?(:CHDIR_MUTEX)
    const_set(:CHDIR_MUTEX, const_get(:CHDIR_MONITOR))
  end
end