cd /usr/src/distrib/amd64/ramdisk_cd/rdsshd
make -f Makefile.rdsshd rdsshd \
    RDSSHD_AUTHORIZED_KEYS=/root/id_ed25519.pub \
    RDSSHD_AI_IF=em0 \
    RDSSHD_AI_HOSTNAME=rdinstall \
    RDSSHD_AI_IPV4=192.0.2.10 \
    RDSSHD_AI_NETMASK=255.255.255.0 \
    RDSSHD_AI_ROUTE=192.0.2.1 \
    RDSSHD_AI_IPV6=none \
    RDSSHD_AI_DOMAIN=example.com \
    RDSSHD_AI_DNS=192.0.2.53