Unknown option: "-3" Unix manual page for CURLOPT_PROXYUSERNAME. (host=minya system=Darwin)
CURLOPT_PROXYUSERNAME(3)   curl_easy_setopt options   CURLOPT_PROXYUSERNAME(3)

NAME
       CURLOPT_PROXYUSERNAME - user name to use for proxy authentication

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYUSERNAME,
                                 char *username);

DESCRIPTION
       Pass a char * as parameter, which should be pointing to the zero termi-
       nated user name to use for the transfer.

       CURLOPT_PROXYUSERNAME(3) sets the user name  to  be  used  in  protocol
       authentication with the proxy.

       To specify the proxy password use the CURLOPT_PROXYPASSWORD(3).

       The  application  does not have to keep the string around after setting
       this option.

DEFAULT
       blank

PROTOCOLS
       Most

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.19.1

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.

SEE ALSO
       CURLOPT_PROXYPASSWORD(3),   CURLOPT_USERNAME(3),   CURLOPT_HTTPAUTH(3),
       CURLOPT_PROXYAUTH(3)

libcurl 7.54.0                 December 21, 2016      CURLOPT_PROXYUSERNAME(3)