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

NAME
       curl_share_init - Create a shared object

SYNOPSIS
       #include <curl/curl.h>

       CURLSH *curl_share_init( );

DESCRIPTION
       This  function  returns  a CURLSH handle to be used as input to all the
       other share-functions, sometimes referred to as a share handle in  some
       places  in  the documentation. This init call MUST have a corresponding
       call to curl_share_cleanup when all operations using the share are com-
       plete.

       This  share handle is what you pass to curl using the CURLOPT_SHARE(3)
       option with curl_easy_setopt(3), to make that specific curl handle  use
       the data in this share.

RETURN VALUE
       If  this  function  returns  NULL, something went wrong (out of memory,
       etc.)  and therefore the share object was not created.

SEE ALSO
       curl_share_cleanup(3), curl_share_setopt(3)

libcurl 7.54.0                 February 03, 2016            curl_share_init(3)