Install missing gems

gistfile1.txt

def install_missing_gems(&block)
  yield
rescue LoadError => e
  gem_name = e.message.split('--').last.strip
  install_command = 'gem install ' + gem_name
  system(install_command) or exit(1)

  Gem.clear_paths
  require gem_name
  retry
end

install_missing_gems do
  require 'ffi-icu'
end