setup_once.h. Inclusion of each header file is based on the definition of NEED_MALLOC_H and NEED_MEMORY_H respectively.
the problem.
CURLOPT_SOCKS5_GSSAPI_SERVICE and CURLOPT_SOCKS5_GSSAPI_NEC to allow libcurl to do GSS-style authentication with SOCKS5 proxies. The curl tool got the options called --socks5-gssapi-service and --socks5-gssapi-nec to enable these.