.SH EXAMPLE
TODO
.SH AVAILABILITY
-For SSL engines that don't support certificate files the CURLOPT_CAINFO option
-is ignored. Refer to http://curl.haxx.se/docs/ssl-compared.html
+If built TLS enabled
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.