# File lib/phusion_passenger/platform_info/apache.rb, line 107
        def self.httpd_V(options = nil)
                if options
                        httpd = options[:httpd] || self.httpd(options)
                else
                        httpd = self.httpd
                end
                if httpd
                        command = "#{httpd} -V"
                        if envvars_file = httpd_envvars_file(options)
                                command = ". '#{envvars_file}' && #{command}"
                        end
                        return `#{command}`
                else
                        return nil
                end
        end