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

NAME
       curl_free  -  reclaim  memory  that has been obtained through a libcurl
       call

SYNOPSIS
       #include <curl/curl.h>

       void curl_free( char *ptr );

DESCRIPTION
       curl_free reclaims memory that has  been  obtained  through  a  libcurl
       call.   Use  curl_free(3) instead of free() to avoid anomalies that can
       result from differences in memory management between  your  application
       and libcurl.

SEE ALSO
       curl_easy_unescape(3), curl_easy_escape(3)

libcurl 7.54.0                 February 03, 2016                  curl_free(3)