musl/include/netinet/tcp.h

#ifndef _NETINET_TCP_H
#define _NETINET_TCP_H

#define TCP_NODELAY 1
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#include <sys/types.h>
#include <sys/socket.h>
#define TCP_MAXSEG	 2
#define TCP_CORK	 3
#define TCP_KEEPIDLE	 4
#define TCP_KEEPINTVL	 5
#define TCP_KEEPCNT	 6
#define TCP_SYNCNT	 7
#define TCP_LINGER2	 8
#define TCP_DEFER_ACCEPT 9
#define TCP_WINDOW_CLAMP 10
#define TCP_INFO	 11
#define	TCP_QUICKACK	 12
#define TCP_CONGESTION	 13
#define TCP_MD5SIG	 14
#endif

#endif