Recent ports tree update renders port compilation of net/libvncserver failure with the error shown below; building host is CURRENT (FreeBSD 13.0-CURRENT #127 r343535: Mon Jan 28 21:34:05 CET 2019 amd64):

[...]
/usr/ports/net/libvncserver/work/libvncserver-LibVNCServer-0.9.12/libvncclient/sasl.c:206:9: warning: implicit declaration of function 'getsockname' is invalid in C99 [-Wimplicit-function-declaration]
    if (getsockname(client->sock, (struct sockaddr*)&localAddress, &addressLength)) {
        ^
/usr/ports/net/libvncserver/work/libvncserver-LibVNCServer-0.9.12/libvncclient/sasl.c:211:35: error: use of undeclared identifier 'AF_INET'
    if (localAddress.ss_family == AF_INET) {
                                  ^
/usr/ports/net/libvncserver/work/libvncserver-LibVNCServer-0.9.12/libvncclient/sasl.c:213:19: error: use of undeclared identifier 'AF_INET'
        inet_ntop(AF_INET, &(sa_in->sin_addr), buf, INET_ADDRSTRLEN);
                  ^
/usr/ports/net/libvncserver/work/libvncserver-LibVNCServer-0.9.12/libvncclient/sasl.c:216:42: error: use of undeclared identifier 'AF_INET6'
    } else if (localAddress.ss_family == AF_INET6) {
                                         ^
/usr/ports/net/libvncserver/work/libvncserver-LibVNCServer-0.9.12/libvncclient/sasl.c:218:19: error: use of undeclared identifier 'AF_INET6'
        inet_ntop(AF_INET6, &(sa_in->sin6_addr), buf, INET6_ADDRSTRLEN);