# File lib/hoe/package.rb, line 90
  def install_gem name, version = nil, rdoc=true
    should_not_sudo = Hoe::WINDOZE || ENV["NOSUDO"] || File.writable?(Gem.dir)
    null_dev = Hoe::WINDOZE ? '> NUL 2>&1' : '> /dev/null 2>&1'

    gem_cmd = Gem.default_exec_format % 'gem'
    sudo    = 'sudo '                  unless should_not_sudo
    local   = '--local'                unless version
    version = "--version '#{version}'" if     version

    cmd  = "#{sudo}#{gem_cmd} install #{local} #{name} #{version}"
    cmd += " --no-rdoc --no-ri" unless rdoc
    cmd += " #{null_dev}" unless Rake.application.options.trace

    puts cmd if Rake.application.options.trace
    system cmd
  end