# File lib/fpm/source/gem.rb, line 9
  def self.flags(opts, settings)
    settings.source[:gem] = "gem"

    opts.on("--bin-path DIRECTORY",
            "The directory to install gem executables") do |path|
      settings.source[:bin_path] = path
    end
    opts.on("--package-prefix PREFIX",
            "Prefix for gem packages") do |package_prefix|
      settings.source[:package_prefix] = package_prefix
    end

    opts.on("--gem PATH_TO_GEM",
            "The path to the 'gem' tool (defaults to 'gem' and searches " \
            "your $PATH)") do |path|
      settings.source[:gem] = path
    end
  end