# File lib/launchy/detect/ruby_engine.rb, line 17
    def self.ruby_engine_error_message( ruby_engine )
      msg = "Unkonwn RUBY_ENGINE "
      if ruby_engine then
        msg += " '#{ruby_engine}'."
      elsif defined?( RUBY_ENGINE ) then
        msg += " '#{RUBY_ENGINE}'."
      else
        msg = "RUBY_ENGINE not defined for #{RUBY_DESCRIPTION}."
      end
      return msg
    end