...like so:
`progress.ro' is up to date.
compile dhcpcd/dhcp.o
/u/NetBSD/src/external/bsd/dhcpcd/dist/src/dhcp.c: In function 'dhcp_arp_probed':
/u/NetBSD/src/external/bsd/dhcpcd/dist/src/dhcp.c:2105:2: error: implicit declaration of function 'ipv4ll_drop' [-Werror=implicit-function-declaration]
ipv4ll_drop(ifp);
^~~~~~~~~~~
cc1: all warnings being treated as errors
*** Failed target: dhcp.o
*** Failed command: /u/NetBSD/arch/amd64/TOOLS/bin/x86_64--netbsd-gcc -Os -fno-asynchronous-unwind-tables -pipe -fstack-protector -Wstack-protector --param ssp-buffer-size=1 -std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wno-sign-compare -Wsystem-headers -Wno-traditional -Wa,--fatal-warnings -Wreturn-type -Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter -Wno-sign-compare -Wold-style-definition -Wconversion -Wsign-compare -Wformat=2 -Wno-format-zero-length -Werror --sysroot=/u/NetBSD/arch/amd64/dest -DHAVE_CONFIG_H -D_OPENBSD_SOURCE -DSMALL -DARP -DINET -DINET6 -DDHCP6 -I/u/NetBSD/src/external/bsd/dhcpcd/include -I/u/NetBSD/src/external/bsd/dhcpcd/dist/src -I/u/NetBSD/arch/amd64/obj/distrib/amd64/ramdisks/ramdisk/dhcpcd -D_FORTIFY_SOURCE=2 -c /u/NetBSD/src/external/bsd/dhcpcd/dist/src/dhcp.c
*** Error code 1
Stop.