module Xcodeproj::Plist::PlistGem

def self.attempt_to_load!
  return @attempt_to_load if defined?(@attempt_to_load)
  @attempt_to_load = begin
    require 'plist/parser'
    require 'plist/generator'
    nil
  rescue LoadError
    'Xcodeproj relies on a library called `plist` to read and write ' \
    'Xcode project files. Ensure you have the `plist` gem installed ' \
    'and try again.'
  end
end