client.c: In function ‘ops_inject_msg’:
client.c:151:15: warning: implicit declaration of function ‘send’ [-Wimplicit-function-declaration]
  151 |         ret = send(oinfo->sock, &msg, sizeof(msg), 0);
      |               ^~~~
client.c: In function ‘recv_otr_msg’:
client.c:553:15: warning: implicit declaration of function ‘recv’ [-Wimplicit-function-declaration]
  553 |         ret = recv(sock, &omsg, sizeof(omsg), 0);
      |               ^~~~
client.c: In function ‘alice_thread’:
client.c:624:23: warning: implicit declaration of function ‘socket’ [-Wimplicit-function-declaration]
  624 |         sock_to_bob = socket(PF_UNIX, SOCK_STREAM, 0);
      |                       ^~~~~~
client.c:624:30: error: ‘PF_UNIX’ undeclared (first use in this function)
  624 |         sock_to_bob = socket(PF_UNIX, SOCK_STREAM, 0);
      |                              ^~~~~~~
client.c:624:30: note: each undeclared identifier is reported only once for each function it appears in
client.c:624:39: error: ‘SOCK_STREAM’ undeclared (first use in this function)
  624 |         sock_to_bob = socket(PF_UNIX, SOCK_STREAM, 0);
      |                                       ^~~~~~~~~~~
client.c:638:15: warning: implicit declaration of function ‘connect’ [-Wimplicit-function-declaration]
  638 |         ret = connect(sock_to_bob, (struct sockaddr *) &bob_sun,
      |               ^~~~~~~
client.c:725:57: warning: implicit declaration of function ‘accept’; did you mean ‘acct’? [-Wimplicit-function-declaration]
  725 |                                         sock_from_bob = accept(fd, (struct sockaddr *) &sun,
      |                                                         ^~~~~~
      |                                                         acct
client.c: In function ‘bob_thread’:
client.c:776:32: error: ‘PF_UNIX’ undeclared (first use in this function)
  776 |         sock_to_alice = socket(PF_UNIX, SOCK_STREAM, 0);
      |                                ^~~~~~~
client.c:776:41: error: ‘SOCK_STREAM’ undeclared (first use in this function)
  776 |         sock_to_alice = socket(PF_UNIX, SOCK_STREAM, 0);
      |                                         ^~~~~~~~~~~
client.c: In function ‘create_unix_socket’:
client.c:979:28: error: ‘PF_UNIX’ undeclared (first use in this function)
  979 |         if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
      |                            ^~~~~~~
client.c:979:37: error: ‘SOCK_STREAM’ undeclared (first use in this function)
  979 |         if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
      |                                     ^~~~~~~~~~~
client.c:986:27: error: ‘AF_UNIX’ undeclared (first use in this function)
  986 |         sun->sun_family = AF_UNIX;
      |                           ^~~~~~~
client.c:990:15: warning: implicit declaration of function ‘bind’ [-Wimplicit-function-declaration]
  990 |         ret = bind(sock, (struct sockaddr *) sun, sizeof(struct sockaddr_un));
      |               ^~~~
client.c:996:15: warning: implicit declaration of function ‘listen’ [-Wimplicit-function-declaration]
  996 |         ret = listen(sock, 10);
      |               ^~~~~~