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SOL_TCP and TCP_KEEPIDLE undefined on macOS

Building usbredir on macOS 10.14.2 fails with:

usbredirserver.c:376:39: error: use of undeclared identifier 'SOL_TCP'
            if (setsockopt(client_fd, SOL_TCP, TCP_KEEPIDLE, &optval, optlen) == -1) {
                                      ^
usbredirserver.c:376:48: error: use of undeclared identifier 'TCP_KEEPIDLE'
            if (setsockopt(client_fd, SOL_TCP, TCP_KEEPIDLE, &optval, optlen) == -1) {
                                               ^
usbredirserver.c:383:39: error: use of undeclared identifier 'SOL_TCP'
            if (setsockopt(client_fd, SOL_TCP, TCP_KEEPINTVL, &optval, optlen) == -1) {
                                      ^
usbredirserver.c:390:39: error: use of undeclared identifier 'SOL_TCP'
            if (setsockopt(client_fd, SOL_TCP, TCP_KEEPCNT, &optval, optlen) == -1) {
                                      ^
4 errors generated.

Following link suggests replacing SOL_TCP --> IPPROTO_TCP and TCP_KEEPIDLE --> TCP_KEEPALIVE:

https://stackoverflow.com/questions/15860127/how-to-configure-tcp-keepalive-under-mac-os-x