docs: function addToPath(directory) {
    var srcs = process.env.PATH.split(delimiter);
    if (srcs.indexOf(directory) === -1) {
      srcs.unshift(directory);
      process.env.PATH = srcs.join(delimiter);
      debug('added `%s` to $PATH and its now `%s`',
        directory, process.env.PATH);
    }
  }