==== dgram ====
cp /home/src/regress/sys/netinet6/recvmsg/../../netinet/recvmsg/recvmsg.c .
cc -O2 -pipe  -Wall -Wpointer-arith -Wuninitialized -Wstrict-prototypes -Wmissing-prototypes -Wunused -Wsign-compare -Wshadow  -MD -MP  -c recvmsg.c
cc   -o recvmsg recvmsg.o 
./recvmsg -6d

==== raw ====
doas -n ./recvmsg -6r