# File lib/rubygems.rb, line 836 def self.required_location(gemname, libfile, *requirements) requirements = Gem::Requirement.default if requirements.empty? matches = Gem.source_index.find_name gemname, requirements return nil if matches.empty? spec = matches.last spec.require_paths.each do |path| result = File.join spec.full_gem_path, path, libfile return result if File.exist? result end nil end