#define GIT_PROXY_OPTIONS_VERSION ...

typedef enum {
	GIT_PROXY_NONE,
	GIT_PROXY_AUTO,
	GIT_PROXY_SPECIFIED,
} git_proxy_t;

typedef struct {
	unsigned int version;
	git_proxy_t type;
	const char *url;
	git_credential_acquire_cb credentials;
	git_transport_certificate_check_cb certificate_check;
	void *payload;
} git_proxy_options;

int git_proxy_init_options(git_proxy_options *opts, unsigned int version);