# File lib/hoe.rb, line 1119
  def install_gem name, version = nil
    gem_cmd = Gem.default_exec_format % 'gem'
    sudo    = 'sudo '                  unless WINDOZE
    local   = '--local'                unless version
    version = "--version '#{version}'" if     version
    sh "#{sudo}#{gem_cmd} install #{local} #{name} #{version}"
  end