Caucho #0004366: Warning: CURL option '75' unknown or unimplemented [curl_setopt]

[Kdecherf]

CURLOPT_BINARYTRANSFER (75) is not implemented.

From Caucho's bugtracker :

There is a warning using tcpdf library (last version) in example 3 for
example_003.php

Warning: CURL option '75' unknown or unimplemented [curl_setopt]