Unknown config option "stream_tls" on motion 4.1.1

I want to use stream_tls option as this link which tells: > This option specifies whether to enable SSL/TLS for the stream port. > For some distributions the library that Motion uses may not have been > compiled with SSL/TLS support. In this situation Motion can not > support SSL/TLS connections. Whether SSL/TLS can be supported will be > reported in the log. In addition to selecting this option, a > webcontrol_cert and webcontrol_key file must also be specified. When I add stream_tls, webcontrol_tls, webcontrol_key and webcontrol_cert, it gives me these logs: [3626632:motion] [ALR] [ALL] conf_cmdparse: Unknown config option "stream_tls" [3626632:motion] [ALR] [ALL] conf_cmdparse: Unknown config option "webcontrol_tls" [3626632:motion] [ALR] [ALL] conf_cmdparse: Unknown config option "webcontrol_key" [3626632:motion] [ALR] [ALL] conf_cmdparse: Unknown config option "webcontrol_cert" I changed the configuration file /etc/motion/motion.conf and these lines: stream_tls on webcontrol_tls on webcontrol_key /etc/motion/motion.key webcontrol_cert /etc/motion/motion.crt In addition, I created /etc/motion/motion.key and /etc/motion/motion.crt by the following procedure: openssl genrsa -out /etc/motion/motion.key 4096 openssl req -new -key /etc/motion/motion.key -out /etc/motion/motion.crt My objective is to make motion stream web page secure (https). I don't know why it's happening. I'm sure the problem is not with .key and .crt file because if I just add stream_tls on, it gives the same error for this option. How can I solve this problem?