ESP8266 Community Forum

I get unresolved reference to espconn_secure_sent, espconn_secure _set_size and espconn_secure_connect when I compile. I have #INCLUDE "espconn.h" in my code but that file only has prototypes for these functions.
The ESP8266_nonos API reference manual says that the code for those functions is in espconn.h but I can only find the prototypes. Please help.

Thanks