It appears that in Win64, SOCKET is a long long.

No more using the standard int type and having it work.
Thanks Microsoft.

src/syncterm/conn.c

@@ -362,7 +362,7 @@ conn_send(const void *vbuffer, size_t buflen, unsigned int timeout)
 	return found;
 }
 
-int
+SOCKET
 conn_connect(struct bbslist *bbs)
 {
 	char str[64];

src/syncterm/conn.h

@@ -86,7 +86,7 @@ struct conn_buffer {
 int conn_recv_upto(void *buffer, size_t buflen, unsigned int timeout);
 int conn_send(const void *buffer, size_t buflen, unsigned int timeout);
 int conn_send_raw(const void *buffer, size_t buflen, unsigned int timeout);
-int conn_connect(struct bbslist *bbs);
+SOCKET conn_connect(struct bbslist *bbs);
 int conn_close(void);
 bool conn_connected(void);
 size_t conn_data_waiting(void);