all ===> usr.sbin/ipf/iptest
cc -O  -Werror -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith  -I/usr/src/usr.sbin/ipf/iptest/../ipsend -I/usr/src/usr.sbin/ipf/iptest/../ipftest -I/usr/src/usr.sbin/ipf/iptest/../ipf -c /usr/src/usr.sbin/ipf/iptest/iptests.c
cc1: warnings being treated as errors
In file included from /usr/src/usr.sbin/ipf/iptest/iptests.c:24:
/usr/include/sys/file.h:96: warning: `struct iovec' declared inside parameter list
/usr/include/sys/file.h:96: warning: its scope is only this definition or declaration,
/usr/include/sys/file.h:96: warning: which is probably not what you want.
/usr/include/sys/file.h:98: warning: `struct iovec' declared inside parameter list
*** Error code 1

Stop.