class Bundler::Source::Git

def install(spec, options = {})
  force = options[:force]
  print_using_message "Using #{version_message(spec)} from #{self}"
  if (requires_checkout? && !@copied) || force
    Bundler.ui.debug "  * Checking out revision: #{ref}"
    git_proxy.copy_to(install_path, submodules)
    serialize_gemspecs_in(install_path)
    @copied = true
  end
  generate_bin_options = { :disable_extensions => !Bundler.rubygems.spec_missing_extensions?(spec), :build_args => options[:build_args] }
  generate_bin(spec, generate_bin_options)
  requires_checkout? ? spec.post_install_message : nil
end