Unknown option: "-3" Unix manual page for curl_formfree. (host=minya system=Darwin)
curl_formfree(3)                libcurl Manual                curl_formfree(3)

NAME
       curl_formfree  -  free  a previously build multipart/formdata HTTP POST
       chain

SYNOPSIS
       #include <curl/curl.h>

       void curl_formfree(struct curl_httppost *form);

DESCRIPTION
       curl_formfree() is used to clean up data previously built/appended with
       curl_formadd(3). This must be called when the data has been used, which
       typically means after curl_easy_perform(3) has been called.

       The pointer to free is the same pointer you passed to the CURLOPT_HTTP-
       POST(3) option, which is the firstitem pointer from the curl_formadd(3)
       invoke(s).

       form is the pointer as returned from a previous call to curl_formadd(3)
       and may be NULL.

RETURN VALUE
       None

SEE ALSO
       curl_formadd(3)

libcurl 7.54.0                   May 02, 2016                 curl_formfree(3)