introduced in linux-v3.10 commit 7d4c04fc170087119727119074e72445f2bb192b
@ -194,6 +194,7 @@ struct linger
#define SO_PEEK_OFF 42
#define SO_NOFCS 43
#define SO_LOCK_FILTER 44
#define SO_SELECT_ERR_QUEUE 45
#ifndef SOL_SOCKET
#define SOL_SOCKET 1