I just experienced the same error.

--- Original message ---

Date: Wed, 18 Sep 2002 10:00:51 -0700 (PDT)
From: Hisashi T Fujinaka <htodd@twofifty.com>
To: current-users@netbsd.org
Subject: new current build error: kdump

Like always, tried recvs, tried cleaning directory manually, tried
building manually, fiddled with source files, etc, etc.

Probably just bad timing, but I can't tell, so here's the error.

CC="/usr/src/tools/obj/tools.NetBSD-1.6H-i386/bin/i386--netbsdelf-gcc"
DESTDIR= /bin/sh /usr/src/usr.bin/kdump/../kdump/mkioctls
/usr/include/sys/ioctl.h  /usr/include/sys/ioctl_compat.h > ioctl.c
make: don't know how to make subr.c. Stop

make: stopped in /usr/src/usr.bin/kdump